Cisco Unified Communications Manager and Interoperability Configuration Guide, Cisco IOS Release 15M&T
VoIP for IPv6
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VoIP for IPv6

Contents

VoIP for IPv6

This document describes VoIP in IPv6 (VoIPv6), a feature that adds IPv6 capability to existing VoIP features. This feature adds dual-stack (IPv4 and IPv6) support on voice gateways and media termination points (MTPs), IPv6 support for Session Initiation Protocol (SIP) trunks, and support for Skinny Client Control Protocol (SCCP)-controlled analog voice gateways. In addition, the Session Border Controller (SBC) functionality of connecting a SIP IPv4 or H.323 IPv4 network to a SIP IPv6 network is implemented on a Cisco UBE to facilitate migration from VoIPv4 to VoIPv6.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Prerequisites for VoIP for IPv6

  • Cisco Express Forwarding for IPv6 must be enabled.
  • Virtual routing and forwarding (VRF) is not supported in IPv6 calls.
Cisco Unified Border Element
  • Cisco IOS Release 12.4(22)T or a later release must be installed and running on your Cisco UBE.
Cisco Unified Border Element (Enterprise)
  • Cisco IOS XE Release 3.3S or a later release must be installed and running on your Cisco ASR 1000 Series Router.

Restrictions for Implementing VoIP for IPv6

Media Flow–Through

The following are the restrictions for Cisco UBE features:

  • Video call flows with Alternative Network Address Types (ANAT) are not supported.
  • WebEx call flow with ANAT are not supported (Cisco UBE does not support ANAT on Video and Application media types).

SDP Pass-Through

  • Supports only Early Offer (EO)–Early Offer (EO) and Delayed Offer (DO)–Delayed Offer (DO) call flows.
  • Delayed Offer–Early Offer call flow falls back to Delayed Offer–Delayed Offer call flow.
  • Supplementary services are not supported on SDP Pass-Through.
  • Transcoding and DTMF interworking are not supported.

    Note


    The above SDP Pass–Through restrictions are applicable for both IPv4 and IPv6.
  • SDP Pass–Through does not support the dual-stack functionality.
  • ANAT call flows does not support IPv4-to-IPv6 and IPv6-to-IPv4 Media interworking.

UDP Checksum

  • CEF and process options are not supported on ASR1000 series routers.
  • None option is partially supported on ISR–G2.

Media Anti–Trombone

  • Media Anti–Trombone is not enabled if the initial call before tromboning is in Flow–Around (FA) mode.
  • Media Anti–Trombone supports only symmetric media address type interworking (IPv4-IPv4 or IPv6-IPv6 media) with or without ANAT.
  • Does not provide support for IPv4-IPv6 interworking cases with or without ANAT because Cisco UBE cannot operate in FA mode post tromboning.

Information About VoIP for IPv6

SIP Features Supported on IPv6

The Session Initiation Protocol (SIP) is an alternative protocol developed by the Internet Engineering Task Force (IETF) for multimedia conferencing over IP.

The Cisco SIP functionality enables Cisco access platforms to signal the setup of voice and multimedia calls over IP networks. SIP features also provide advantages in the following areas:
  • Protocol extensibility
  • System scalability
  • System scalability
  • Personal mobility services
  • Interoperability with different vendors

A SIP User Agent (UA) operates in one of the following three modes:

  • IPv4-only: Communication with only IPv6 UA is unavailable.
  • IPv6-only: Communication with only IPv4 UA is unavailable.
  • Dual-stack: Communication with only IPv4, only IPv6 and dual-stack UAs are available.

Dual-stack SIP UAs use Alternative Network Address Transport (ANAT) grouping semantics:

  • Includes both IPv4 and IPv6 addresses in the Session Description Protocol (SDP).
  • Is automatically enabled in dual-stack mode (can be disabled if required).
  • Requires media to be bound to an interface that have both IPv4 and IPv6 addresses.
  • Described in RFC 4091 and RFC 4092 (RFC 5888 describes general SDP grouping framework).

SIP UAs use “sdp-anat” option tag in the Required and Supported SIP header fields:

  • Early Offer (EO) INVITE using ANAT semantics places “sdp-anat” in the Require header.
  • Delayed Offer (DO) INVITE places “sdp-anat” in the Supported header.
SIP Signaling and Media Address Selection:
  • Source address for SIP signaling is selected based on the destination signaling address type configured in the session-target of the outbound dial-peer:
    • If signaling bind is configured, source SIP signaling address is chosen from the bound interface.
    • If signaling bind is not configured, source SIP signaling address is chosen based on the best address in the UA to reach the destination signaling address.

SDP may or may not use ANAT semantics:

  • When ANAT is used, media addresses in SDP are chosen from the interface media that is configured. When ANAT is not used, media addresses in SDP are chosen from the interface media that is configured OR based on the best address to reach the destination signaling address (when no media bind is configured).

SIP Voice Gateways in VoIPv6

Session Initiation Protocol (SIP) is a simple, ASCII-based protocol that uses requests and responses to establish communication among the various components in the network and to ultimately establish a conference between two or more endpoints.

In addition to the already existing features that are supported on IPv4 and IPv6, the SIP Voice Gateways support the following features:

  • History–Info: The SIP History–info Header Support feature provides support for the history-info header in SIP INVITE messages only. The SIP gateway generates history information in the INVITE message for all forwarded and transferred calls. The history-info header records the call or dialog history. The receiving application uses the history-info header information to determine how and why the call has reached it. For more information, refer to the “SIP History INFO” section in the Cisco Unified Border Element (Enterprise) SIP Support Configuration Guide.
  • Handling 181/183 Responses with/without SDP: The Handling 181/183 Responses with/without SDP feature provides support for SIP 181 (Call is Being Forwarded) and SIP 183 (Session Progress) messages either globally or on a specific dial-peer. Also, you can control when the specified SIP message is dropped based on either the absence or presence of SDP information. For more information, refer to “SIP–Enhanced 180 Provisional Response Handling” section in the Cisco Unified Border Element Configuration Guide.
  • Limiting the Rate of Incoming SIP Calls per Dial-Peer (Call Spike): The call rate-limiting feature for incoming SIP calls starts working after a switch over in a SIP call. The rate–limiting is done for new calls received on the new Active. The IOS timers that track the call rate limits runs on active and standby mode and does not require any checkpoint. However, some statistics for calls rejected requires to be checked for the show commands to be consistent before and after the switchover.
  • PPI/PAI/Privacy and RPID Passing: For incoming SIP requests or response messages, when the PAI or PPI privacy header is set, the SIP gateway builds the PAI or PPI header into the common SIP stack, thereby providing support to handle the call data present in the PAI or PPI header. For outgoing SIP requests or response messages, when the PAI or PPI privacy header is set, privacy information is sent using the PAI or PPI header. For more information, refer to the “Support for PAID PPID Privacy PCPID and PAURI Headers on Cisco UBE” section in the Cisco Unified Border Element SIP Support Configuration Guide.
  • SIP VMWI for FXS phones: SIP provides visible message waiting indication (VMWI) on FXS phones. This feature provides users with the option to enable one message waiting indication (MWI): audible, visible, or both. The VMWI mechanism uses SIP Subscribe or Notify to get MWI updates from a virtual machine (VM) system, and then forwards updates to the FXS phone on the port. For more information, refer to the “Configuring SIP MWI Features” section in the SIP Configuration Guide.
  • SIP Session timer (RFC 4028): This feature allows for a periodic refresh of SIP sessions through a re-INVITE or UPDATE request. The refresh allows both user agents and proxies to determine whether the SIP session is still active. Two header fields can be defined: Session-Expires, which conveys the lifetime of the session, and Min-SE, which conveys the minimum allowed value for the session timer. For more information, refer to the “SIP Session Timer Support” section in the Cisco Unified Border Element SIP Support Configuration Guide.
  • SIP Media Inactivity Detection: The SIP Media Inactivity Detection Timer feature enables Cisco gateways to monitor and disconnect VoIP calls if no Real-Time Control Protocol (RTCP) packets are received within a configurable time period. For more information, refer to the SIP Media Inactivity Timer section.

The SIP Voice Gateways feature is supported for analog endpoints that are connected to Foreign Exchange Station (FXS) ports or a Cisco VG224 Analog Phone Gateway and controlled by a Cisco call-control system, such as a Cisco Unified Communications Manager (Cisco Unified CM) or a Cisco Unified Communications Manager Express (Cisco Unified CME).

For more information on SIP Gateway features and information about configuring the SIP voice gateway for VoIPv6, see the c_​Configuring_​a_​SIP_​Voice_​Gateway_​for_​IPv6_​1058563.xml#con_​1058563.

VoIPv6 Support on Cisco UBE

Cisco UBE in VoIPv6 adds IPv6 capability to VoIP features. This feature adds dual-stack support on voice gateways, IPv6 support for SIP trunks, support for SCCP-controlled analog voice gateways, support for real-time control protocol (RTCP) pass-through, and support for T.38 fax over IPv6.

For more information on these features, refer to the following:

Support has been added for audio calls in media Flow–Through (FT) and Flow–Around (FA) modes, High Density (HD) transcoding, Local Transcoding Interface (LTI), along with Voice Class Codec (VCC) support, support for Hold/Resume, REFER, re-INVITE, 302 based services, and support for media anti-trombone have been added to Cisco UBE.

Cisco UBE being a signaling proxy processes all signaling messages for setting up media channels. This enables Cisco UBE to affect the flow of media packets using the media flow-through and the media flow-around modes.

  • Media FT and Media FA modes support the following call flows:
    • EO–to–EO
    • DO–to–DO
    • DO–to–EO
  • Media Flow-Through (FT): In a media flow–through mode, between two endpoints, both signaling and media flows through the IP-to-IP Gateway (IPIP GW). The IPIP GW performs both signaling and media interworking between H.323/SIP IPv4 and SIP IPv6 networks.
    Figure 1. H.323/SIP IPv4 – SIP IPv6 interworking in media flow-through mode

  • Media Flow-Around (FA): Media flow–around provides the ability to have a SIP video call whereby signaling passes through Cisco UBE and media pass directly between endpoints bypassing the Cisco UBE.
    Figure 2. H.323/SIP IPv4 - SIP IPv6 interworking in media flow-around mode

  • Assisted RTCP (RTCP Keepalive): Assisted Real-time Transport Control Protocol (RTCP) enables Cisco UBE to generate RTCP keepalive reports on behalf of endpoints; however, endpoints, such as second generation Cisco IP phones (7940/7960) and Nortel Media Gateways (MG 1000T) do not generate any RTCP keepalive reports. Assisted RTCPs enable customers to use Cisco UBE to interoperate between endpoints and call control agents, such as Microsoft OCS/Lync so that RTCP reports are generated to indicate session liveliness during periods of prolonged silence, such as call hold or call on mute. The assisted RTCP feature helps Cisco UBE to generate standard RTCP keepalive reports on behalf of endpoints. RTCP reports determine the liveliness of a media session during prolonged periods of silence, such as a call on hold or a call on mute.
  • SDP Pass–Through: SDP is configured to pass through transparently at the Cisco UBE, so that both the remote ends can negotiate media independently of the Cisco UBE.
    SDP pass-through is addressed in two modes:
    • Flow-through—Cisco UBE plays no role in the media negotiation, it blindly terminates and re-originates the RTP packets irrespective of the content type negotiated by both the ends. This supports address hiding and NAT traversal.
    • Flow-around—Cisco UBE neither plays a part in media negotiation, nor does it terminate and re-originate media. Media negotiation and media exchange is completely end-to-end.
    For more information, refer to the “Configurable Pass-through of SIP INVITE Parameters” section in the Cisco Unified Border Element SIP Support Configuration Guide.
  • UDP Checksum for IPv6: User Datagram Protocol (UDP) checksums provide data integrity for addressing different functions at the source and destination of the datagram, when a UDP packet originates from an IPv6 node.
  • IP Toll Fraud:The IP Toll Fraud feature checks the source IP address of the call setup before routing the call. If the source IP address does not match an explicit entry in the configuration as a trusted VoIP source, the call is rejected. For more information, refer to the “Configuring Toll Fraud Prevention” section in the Cisco Unified Communications Manager Express System Administrator Guide.
  • RTP Port Range: Provides the capability where the port range is managed per IP address range. This features solves the problem of limited number of rtp ports for more than 4000 calls. It enables combination of an IP address and a port as a unique identification for each call.
  • Hold/Resume: Cisco UBE supports supplementary services such as Call Hold and Resume. An active call can be put in held state and later the call can be resumed. For more information, refer to the “Configuring Call Hold/Resume for Shared Lines for Analog Ports” section in Supplementary Services Features for FXS Ports on Cisco IOS Voice Gateways Configuration Guide.
  • Call Transfer (re-INVITE, REFER): Call transfer is used for conference calling, where calls can transition smoothly between multiple point-to-point links and IP level multicasting. For more information, refer to the “Configurable Pass-through of SIP INVITE Parameters” section in the Cisco Unified Border Element SIP Support Configuration Guide.
  • Call Forward (302 based): SIP provides a mechanism for forwarding or redirecting incoming calls. A Universal Access Servers (UAS) can redirect an incoming INVITE by responding with a 302 message (moved temporarily).
    • Consumption of 302 at stack level is supported for EO-EO, DO-DO and DO-EO calls for all combination of IPv4/IPv6/ANAT.
    • Consumption of 302 at stack level is supported for both FT and FA calls.
    For more information, refer to the “ Configuring Call Transfer and Forwarding” section in Cisco Unified Communications Manager Express System Administrator Guide.
  • Media Antitrombone: Antitromboning is a media signaling service in SIP entity to overcome the media loops. Media Trombones are media loops in a SIP entity due to call transfer or call forward. Media loops in Cisco UBE are not detected because Cisco UBE looks at both call types as individual calls and not calls related to each other. Antitrombone service has to be enabled only when no media interworking is required in both legs. Media antitrombone is supported only when the initial call is in IPv4 to IPv4 or IPv6 to IPv6 mode only. For more information, refer to the “Configuring Media Antitrombone” section in the Cisco Unified Border Element Protocol-Independent Features and Setup Configuration Guide.
  • RE-INVITE Consumption: The Re-INVITE/UPDATE consumption feature helps to avoid interoperability issues by consuming the mid-call Re-INVITEs/UPDATEs from Cisco UBE. As Cisco UBE blocks RE-INVITE / mid-call UPDATE, remote participant is not made aware of the SDP changes, such as Call Hold, Call Resume, and Call transfer. For more information, refer to the “Cisco UBE Mid-call Re-INVITE/UPDATE Consumption” section in the Cisco Unified Border Element Protocol-Independent Features and Setup Configuration Guide.
  • Address Hiding: The address hiding feature ensures that the Cisco UBE is the only point of signaling and media entry/exit in all scenarios. When you configure address-hiding, signaling and media peer addresses are also hidden from the endpoints, especially for supplementary services when the Cisco UBE passes REFER/3xx messages from one leg to the other. For more information, refer to the “Configuring Address Hiding” section in the SIP-to-SIP Connections on a Cisco Unified Border Element.
  • Header Passing: Header Pass through enables header passing for SIP INVITE, SUBSCRIBE and NOTIFY messages; disabling header passing affects only incoming INVITE messages. Enabling header passing results in a slight increase in memory and CPU utilization. For more information, refer to the “SIP-to-SIP Connections on a Cisco Unified Border Element” section in the SIP-to-SIPConnections on Cisco Unified Border Element.
  • Refer–To Passing: The Refer-to Passing feature is enabled when you configure refer-to-passing in Refer Pass through mode and the supplementary service SIP Refer is already configured. This enables the received refer-to header in Refer Pass through mode to move to the outbound leg without any modification. However, when refer-to-passing is configured in Refer Consumption mode without configuring the supplementary-service SIP Refer, the received Refer-to URI is used in the request-URI of the triggered invite. For more information, refer to the “Configuring Support for Dynamic REFER Handling on Cisco UBE” section in the Cisco Unified Border Element SIP Configuration Guide.
  • Error Pass-through: The SIP error message pass through feature allows a received error response from one SIP leg to pass transparently over to another SIP leg. This functionality will pass SIP error responses that are not yet supported on the Cisco UBE or will preserve the Q.850 cause code across two sip call-legs. For more information, refer to the “Configuring SIP Error Message Passthrough” section in the Cisco Unified Border Element SIP Support Configuration Guide.
  • SIP UPDATE Interworking: The SIP UPDATE feature allows a client to update parameters of a session (such as, a set of media streams and their codecs) but has no impact on the state of a dialog. UPDATE with SDP will support SDP Pass through, media flow around and media flow through. UPDATE with SDP support for SIP to SIP call flows is supported in the following scenarios:
    • Early Dialog SIP to SIP media changes.
    • Mid Dialog SIP to SIP media changes.
    For more information, refer to the “SIP UPDATE Message per RFC 3311” section in the Cisco Unified Border Element SIP Support Configuration Guide.
  • SIP OPTIONS Ping: The OPTIONS ping mechanism monitors the status of a remote Session Initiation Protocol (SIP) server, proxy or endpoints. Cisco UBE monitors these endpoints periodically. For more information, refer to the “Cisco UBE Out-of-dialog OPTIONS Ping for Specified SIP Servers or Endpoints” section in the Configuration of SIP Trunking for PSTN Access (SIP-to-SIP) Configuration Guide.
  • Configurable Error Response Code in OPTIONS Ping: Cisco UBE provides an option to configure the error response code when a dial peer is busied out because of an Out-of-Dialog OPTIONS ping failure. For more information, refer to the “Configuring an Error Response Code upon an Out-of-Dialog OPTIONS Ping Failure” section in the Cisco Unified Border Element SIP Support Configuration Guide.
  • SIP Profiles: SIP profiles create a set of provisioning properties that you can apply to SIP trunk.
  • Dynamic Payload Type Interworking (DTMF and Codec Packets): The Dynamic Payload Type Interworking for DTMF and Codec Packets for SIP-to-SIP Calls feature provides dynamic payload type interworking for dual tone multifrequency (DTMF) and codec packets for Session Initiation Protocol (SIP) to SIP calls. The Cisco UBE interworks between different dynamic payload type values across the call legs for the same codec. Also, Cisco UBE supports any payload type value for audio, video, named signaling events (NSEs), and named telephone events (NTEs) in the dynamic payload type range 96 to 127. For more information, refer to the “Dynamic Payload Type Interworking for DTMF and Codec Packets for SIP-to-SIP Calls” section in the Cisco Unified Border Element (Enterprise) Protocol-Independent Features and Setup Configuration Guide.
  • Audio Transcoding using Local Transcoding Interface (LTI): Local Transcoding Interface (LTI) is an interface created to remove the requirement of SCCP client for Cisco UBE transcoding. For information, refer to Cisco Unified Border Element 9.0 Local Transcoding Interface (LTI).
  • Voice Class Codec (VCC) with or without Transcoding: The Voice Class Codec feature supports basic and all Re-Invite based supplementary services like call-hold/resume, call forward, call transfer, where if any mid-call codec changes, Cisco UBE inserts/removes/modifies the transcoder as needed. Support for negotiation of an Audio Codec on each leg of a SIP–SIP call on the Cisco UBE feature supports negotiation of an audio codec using the Voice Class Codec (VCC) infrastructure on Cisco UBE. VCC supports SIP-SIP calls on Cisco UBE and allows mid-call codec change for supplementary services.

How to Configure VoIP for IPv6

Configuring VoIP for IPv6

SIP is a simple, ASCII-based protocol that uses requests and responses to establish communication among the various components in the network and to ultimately establish a conference between two or more endpoints.

Users in a SIP network are identified by unique SIP addresses. A SIP address is similar to an e-mail address and is in the format of sip:userID@gateway.com. The user ID can be either a username or an E.164 address. The gateway can be either a domain (with or without a hostname) or a specific Internet IPv4 or IPv6 address.

A SIP trunk can operate in one of three modes: SIP trunk in IPv4-only mode, SIP trunk in IPv6-only mode, and SIP trunk in dual-stack mode, which supports both IPv4 and IPv6.

A SIP trunk uses the Alternative Network Address Transport (ANAT) mechanism to exchange multiple IPv4 and IPv6 media addresses for the endpoints in a session. ANAT is automatically enabled on SIP trunks in dual-stack mode. The ANAT Session Description Protocol (SDP) grouping framework allows user agents (UAs) to include both IPv4 and IPv6 addresses in their SDP session descriptions. The UA is then able to use any of its media addresses to establish a media session with a remote UA.

A Cisco Unified Border Element can interoperate between H.323/SIP IPv4 and SIP IPv6 networks in media flow-through mode. In media flow-through mode, both signaling and media flows through the Cisco Unified Border Element, and the Cisco Unified Border Element performs both signaling and media interoperation between H.323/SIP IPv4 and SIP IPv6 networks (see the figure below).

Figure 3. H.323/SIP IPv4--SIP IPv6 Interoperating in Media Flow-Through Mode

Shutting Down or Enabling VoIPv6 Service on Cisco Gateways

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    voice service voip

    4.    shutdown [ forced]


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Device> enable
    
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.
     
    Step 2 configure terminal


    Example:
    Device# configure terminal
    
     

    Enters global configuration mode.

     
    Step 3 voice service voip


    Example:
    Device(config)# voice service voip
    
     

    Enters voice service VoIP configuration mode.

     
    Step 4 shutdown [ forced]


    Example:
    Device(config-voi-serv)# shutdown forced
     
     

    Shuts down or enables VoIP call services.

     

    Shutting Down or Enabling VoIPv6 Submodes on Cisco Gateways

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    voice service voip

      4.    sip

      5.    call service stop [forced]


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Device> enable
      
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.
       
      Step 2 configure terminal


      Example:
      Device# configure terminal
      
       

      Enters global configuration mode.

       
      Step 3 voice service voip


      Example:
      Device(config)# voice service voip
      
       

      Enters voice service VoIP configuration mode.

       
      Step 4 sip


      Example:
      Device(config-voi-serv)# sip
      
       

      Enters SIP configuration mode.

       
      Step 5 call service stop [forced]


      Example:
      Device(config-serv-sip)# call service stop
      
       

      Shuts down or enables VoIPv6 for the selected submode.

       

      Configuring the Protocol Mode of the SIP Stack

      Before You Begin

      SIP service should be shut down before configuring the protocol mode. After configuring the protocol mode as IPv6, IPv4, or dual-stack, SIP service should be reenabled.

      SUMMARY STEPS

        1.    enable

        2.    configure terminal

        3.    sip-ua

        4.    protocol mode ipv4 | ipv6 | dual-stack [preference {ipv4 | ipv6}]}


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 enable


        Example:
        Device> enable
        
         

        Enables privileged EXEC mode.

        • Enter your password if prompted.
         
        Step 2 configure terminal


        Example:
        Device# configure terminal
        
         

        Enters global configuration mode.

         
        Step 3 sip-ua


        Example:
        Device(config)# sip-ua
        
         

        Enters SIP user agent configuration mode.

         
        Step 4 protocol mode ipv4 | ipv6 | dual-stack [preference {ipv4 | ipv6}]}


        Example:
        Device(config-sip-ua)# protocol mode dual-stack
        
         

        Configures the Cisco IOS SIP stack in dual-stack mode.

         
        Example: Configuring the SIP Trunk

        This example shows how to configure the SIP trunk to use dual-stack mode, with IPv6 as the preferred mode. The SIP service must be shut down before any changes are made to protocol mode configuration.

        Device(config)# sip-ua
        Device(config-sip-ua)# protocol mode dual-stack preference ipv6
        
        Disabling ANAT Mode

        ANAT is automatically enabled on SIP trunks in dual-stack mode. Perform this task to disable ANAT in order to use a single-stack mode.

        SUMMARY STEPS

          1.    enable

          2.    configure terminal

          3.    voice service voip

          4.    sip

          5.    no anat


        DETAILED STEPS
           Command or ActionPurpose
          Step 1 enable


          Example:
          Device> enable
          
           

          Enables privileged EXEC mode.

          • Enter your password if prompted.
           
          Step 2 configure terminal


          Example:
          Device# configure terminal
          
           

          Enters global configuration mode.

           
          Step 3 voice service voip


          Example:
          Device(config)# voice service voip
          
           

          Enters voice service VoIP configuration mode.

           
          Step 4 sip


          Example:
          Device(config-voi-serv)# sip
          
           

          Enters SIP configuration mode.

           
          Step 5 no anat


          Example:
          Device(conf-serv-sip)# no anat
          
           

          Disables ANAT on a SIP trunk.

           

          Verifying SIP Gateway Status

          Before You Begin

          To verify the status of SIP Gateway, use the following commands

          SUMMARY STEPS

            1.    show sip-ua calls

            2.    show sip-ua connections

            3.    show sip-ua status


          DETAILED STEPS
            Step 1   show sip-ua calls

            The show sip-ua calls command displays active user agent client (UAC) and user agent server (UAS) information on SIP calls:

            Device# show sip-ua calls 
            SIP UAC CALL INFO
            	Call 1
            	SIP Call ID : 8368ED08-1C2A11DD-80078908-BA2972D0@2001::21B:D4FF:FED7:B000
            		State of the call       : STATE_ACTIVE (7)
            		Substate of the call    : SUBSTATE_NONE (0)
            		Calling Number          : 2000
            		Called Number           : 1000
            		Bit Flags               : 0xC04018 0x100 0x0
            CC Call ID              : 2
               Source IP Address (Sig ): 2001:DB8:0:ABCD::1
               Destn SIP Req Addr:Port : 2001:DB8:0:0:FFFF:5060
               Destn SIP Resp Addr:Port: 2001:DB8:0:1:FFFF:5060
               Destination Name        : 2001::21B:D5FF:FE1D:6C00
               Number of Media Streams : 1
               Number of Active Streams: 1
               RTP Fork Object         : 0x0
               Media Mode              : flow-through
               Media Stream 1
                 State of the stream      : STREAM_ACTIVE
                 Stream Call ID           : 2
                 Stream Type              : voice-only (0)
                 Stream Media Addr Type   : 1709707780
                 Negotiated Codec         :  (20 bytes)
                 Codec Payload Type       : 18 
                 Negotiated Dtmf-relay    : inband-voice
                 Dtmf-relay Payload Type  : 0
                 Media Source IP Addr:Port: [2001::21B:D4FF:FED7:B000]:16504
                 Media Dest IP Addr:Port  : [2001::21B:D5FF:FE1D:6C00]:19548
            Options-Ping    ENABLED:NO    ACTIVE:NO
               Number of SIP User Agent Client(UAC) calls: 1
            SIP UAS CALL INFO
               Number of SIP User Agent Server(UAS) calls: 0
            Step 2   show sip-ua connections

            Use the show sip-ua connections command to display SIP UA transport connection tables:



            Example:
            Device# show sip-ua connections udp brief 
            Total active connections      : 1
            No. of send failures          : 0
            No. of remote closures        : 0
            No. of conn. failures         : 0
            No. of inactive conn. ageouts : 0
            Router# show sip-ua connections udp detail
             
            Total active connections      : 1
            No. of send failures          : 0
            No. of remote closures        : 0
            No. of conn. failures         : 0
            No. of inactive conn. ageouts : 0
            ---------Printing Detailed Connection Report---------
            Note:
             ** Tuples with no matching socket entry
                - Do 'clear sip <tcp[tls]/udp> conn t ipv4:<addr>:<port>'
                  to overcome this error condition
             ++ Tuples with mismatched address/port entry
                - Do 'clear sip <tcp[tls]/udp> conn t ipv4:<addr>:<port> id <connid>'
                  to overcome this error condition
            Remote-Agent:2001::21B:D5FF:FE1D:6C00, Connections-Count:1
              Remote-Port Conn-Id Conn-State  WriteQ-Size
              =========== ======= =========== ===========
                     5060       2 Established           0
            
            Step 3   show sip-ua status

            Use the show sip-ua status command to display the status of the SIP UA:



            Example:
            Device# show sip-ua status
            SIP User Agent Status
            SIP User Agent for UDP : ENABLED
            SIP User Agent for TCP : ENABLED
            SIP User Agent for TLS over TCP : ENABLED
            SIP User Agent bind status(signaling): DISABLED 
            SIP User Agent bind status(media): DISABLED 
            SIP early-media for 180 responses with SDP: ENABLED
            SIP max-forwards : 70
            SIP DNS SRV version: 2 (rfc 2782)
            NAT Settings for the SIP-UA
            Role in SDP: NONE
            Check media source packets: DISABLED
            Maximum duration for a telephone-event in NOTIFYs: 2000 ms
            SIP support for ISDN SUSPEND/RESUME: ENABLED
            Redirection (3xx) message handling: ENABLED
            Reason Header will override Response/Request Codes: DISABLED
            Out-of-dialog Refer: DISABLED
            Presence support is DISABLED
            protocol mode is ipv6
            SDP application configuration:
             Version line (v=) required
             Owner line (o=) required
             Timespec line (t=) required
             Media supported: audio video image 
             Network types supported: IN 
             Address types supported: IP4 IP6 
             Transport types supported: RTP/AVP udptl 

            RTCP Pass-Through

            IPv4 and IPv6 addresses embedded within RTCP packets (for example, RTCP CNAME) are passed on to Cisco UBE without being masked. These addresses are masked on the Cisco UBE ASR 1000.

            The Cisco UBE ASR 1000 does not support printing of RTCP debugs.


            Note


            RTCP is passed through by default. No configuration is required for RTCP pass-through.

            Configuring IPv6 Support for Cisco UBE

            In Cisco UBE, IPv4-only and IPv6-only modes are not supported when endpoints are dual-stack. In this case, Cisco UBE must also be configured in dual-stack mode.

            SUMMARY STEPS

              1.    enable

              2.    configure terminal

              3.    sip-ua

              4.    protocol mode {ipv4 | ipv6 | dual-stack {preference {ipv4 | ipv6}}

              5.    end


            DETAILED STEPS
               Command or ActionPurpose
              Step 1 enable


              Example:
              Device> enable
               

              Enables privileged EXEC mode.

              • Enter your password if prompted.
               
              Step 2 configure terminal


              Example:
              Device# configure terminal
               

              Enters global configuration mode.

               
              Step 3 sip-ua


              Example:
              Device(config)# sip-ua
               

              Enters SIP user-agent configuration mode.

               
              Step 4 protocol mode {ipv4 | ipv6 | dual-stack {preference {ipv4 | ipv6}}


              Example:
              Device(config-sip-ua)# protocol mode ipv6
               

              Configures the Cisco IOS SIP stack.

              • protocol mode dual-stack preference {ipv4 | ipv6} —Sets the IP preference when the ANAT command is configured.
              • protocol mode {ipv4 | ipv6} —Passes the IPv4 or IPv6 address in the SIP invite.
              • protocol mode dual-stack} —Passes both the IPv4 addresses and the IPv6 addresses in the SIP invite and sets priority based on the far-end IP address.
               
              Step 5 end


              Example:
              Device(conf-voi-serv)# end
               

              Exits SIP user-agent configuration mode.

               

              Verifying RTP Pass-Through

              To enable RTCP packet-related debugging, use the following command

              SUMMARY STEPS

                1.    debug voip rtcp packets


              DETAILED STEPS
              debug voip rtcp packets


              Example:
              Device# debug voip rtcp packets
              
              *Feb 14 06:24:58.799: //1/xxxxxxxxxxxx/RTP//Packet/voip_remote_rtcp_packet: Received RTCP packet
              *Feb 14 06:24:58.799: (src ip=2001:DB8:C18:5:21B:D4FF:FEDD:35F0, src port=17699,
              dst ip=2001:DB8:C18:5:21D:A2FF:FE72:4D00, dst port=17103)
              *Feb 14 06:24:58.799: SR: ssrc=0x1F7A35F0 sr_ntp_h=0xD10346B4 sr_ntp_l=0x13173D8
              F sr_timestamp=0x0 sr_npackets=381 sr_nbytes=62176
              *Feb 14 06:24:58.799: RR: ssrc=0x1A1752F0 rr_loss=0x0 rr_ehsr=5748 rr_jitter=0 r
              r_lsr=0x0 rr_dlsr=0x0
              *Feb 14 06:24:58.799: SDES: ssrc=0x1F7A35F0 name=1 len=39 data=0.0.0@2001:DB8:C1
              8:5:21B:D4FF:FEDD:35F0
              *Feb 14 06:24:58.799: //2/xxxxxxxxxxxx/RTP//Packet/voip_remote_rtcp_packet: Send
              ing RTCP packet
              *Feb 14 06:24:58.799: (src ip=2001:DB8:C18:5:21D:A2FF:FE72:4D00, src port=23798,
              dst ip=2001:DB8:C18:5:21B:D4FF:FED7:52F0, dst port=19416)
              *Feb 14 06:24:58.799: SR: ssrc=0x0 sr_ntp_h=0xD10346B4 sr_ntp_l=0x13173D8F sr_ti
              mestamp=0x0 sr_npackets=381 sr_nbytes=62176
              *Feb 14 06:24:58.799: RR: ssrc=0x1A1752F0 rr_loss=0x0 rr_ehsr=5748 rr_jitter=0 r
              r_lsr=0x0 rr_dlsr=0x0
              *Feb 14 06:24:58.799: SDES: ssrc=0x1F7A35F0 name=1 len=39 data=0.0.0@2001:DB8:C1
              8:5:21B:D4FF:FEDD:35F0
              *Feb 14 06:24:58.919:

              Configuring the Source IPv6 Address of Signaling and Media Packets

              Users can configure the source IPv4 or IPv6 address of signaling and media packets to a specific interface’s IPv4 or IPv6 address. Thus, the address that goes out on the packet is bound to the IPv4 or IPv6 address of the interface specified with the bind command.

              The bind command also can be configured with one IPv6 address to force the gateway to use the configured address when the bind interface has multiple IPv6 addresses. The bind interface should have both IPv4 and IPv6 addresses to send out ANAT.

              When you do not specify a bind address or if the interface is down, the IP layer still provides the best local address.

              SUMMARY STEPS

                1.    enable

                2.    configure terminal

                3.    voice service voip

                4.    sip

                5.    bind {control | media | all} source interface interface-id [ipv6-address ipv6-address]


              DETAILED STEPS
                 Command or ActionPurpose
                Step 1 enable


                Example:
                Device> enable
                
                 

                Enables privileged EXEC mode.

                • Enter your password if prompted.
                 
                Step 2 configure terminal


                Example:
                Device# configure terminal
                
                 

                Enters global configuration mode.

                 
                Step 3 voice service voip


                Example:
                Device(config)# voice service voip
                
                 

                Enters voice service VoIP configuration mode.

                 
                Step 4 sip


                Example:
                Device(config-voi-serv)# sip
                
                 

                Enters SIP configuration mode.

                 
                Step 5 bind {control | media | all} source interface interface-id [ipv6-address ipv6-address]


                Example:
                Device(config-serv-sip)# bind control source-interface FastEthernet 0/0
                
                 

                Binds the source address for signaling and media packets to the IPv6 address of a specific interface.

                 

                Example: Configuring the Source IPv6 Address of Signaling and Media Packets

                Device(config)# voice service voip
                Device(config-voi-serv)# sip
                Device(config-serv-sip)# bind control source-interface fastEthernet 0/0
                

                Configuring the SIP Server

                SUMMARY STEPS

                  1.    enable

                  2.    configure terminal

                  3.    sip-ua

                  4.    sip-server {dns: host-name] | ipv4: ipv4address | ipv6: [ipv6-address] :[port-nums]}

                  5.    keepalive target {{ipv4 : address | ipv6 : address}[: port] | dns : hostname} [ tcp [tls]] | udp] [secondary]


                DETAILED STEPS
                   Command or ActionPurpose
                  Step 1 enable


                  Example:
                  Device> enable
                  
                   

                  Enables privileged EXEC mode.

                  • Enter your password if prompted.
                   
                  Step 2 configure terminal


                  Example:
                  Device# configure terminal
                  
                   

                  Enters global configuration mode.

                   
                  Step 3 sip-ua


                  Example:
                  Device(config)# sip-ua
                  
                   

                  Enters SIP user agent configuration mode.

                   
                  Step 4 sip-server {dns: host-name] | ipv4: ipv4address | ipv6: [ipv6-address] :[port-nums]}

                  Example:
                  Device(config-sip-ua)# sip-server ipv6: 2001:DB8:0:0:8:800:200C:417A
                  
                   

                  Configures a network address for the SIP server interface.

                   
                  Step 5 keepalive target {{ipv4 : address | ipv6 : address}[: port] | dns : hostname} [ tcp [tls]] | udp] [secondary]


                  Example:
                  Device(config-sip-ua)# keepalive target ipv6: 2001:DB8:0:0:8:800:200C:417A
                  
                   

                  Identifies SIP servers that will receive keepalive packets from the SIP gateway.

                   

                  Example: Configuring the SIP Server

                  Device(config)# sip-ua
                  Device(config-sip-ua)# sip-server ipv6: 2001:DB8:0:0:8:800:200C:417A
                  

                  Configuring the Session Target

                  SUMMARY STEPS

                    1.    enable

                    2.    configure terminal

                    3.    dial-peer voice tag {mmoip | pots | vofr | voip}

                    4.    destination pattern [+ string T

                    5.    session target {ipv4: destination-address| ipv6: [ destination-address ]| dns : $s$. | $d$. | $e$. | $u$.] host-name | enum:table -num | loopback:rtp | ras| sip-server} [: port


                  DETAILED STEPS
                     Command or ActionPurpose
                    Step 1 enable


                    Example:
                    Device> enable
                    
                     

                    Enables privileged EXEC mode.

                    • Enter your password if prompted.
                     
                    Step 2 configure terminal


                    Example:
                    Device# configure terminal
                    
                     

                    Enters global configuration mode.

                     
                    Step 3 dial-peer voice tag {mmoip | pots | vofr | voip}


                    Example:
                    Device(config)# dial-peer voice 29 voip
                    
                     

                    Defines a particular dial peer, specifies the method of voice encapsulation, and enters dial peer configuration mode.

                     
                    Step 4 destination pattern [+ string T


                    Example:
                    Device(config-dial-peer)# destination-pattern 7777
                     

                    Specifies either the prefix or the full E.164 telephone number to be used for a dial peer.

                     
                    Step 5 session target {ipv4: destination-address| ipv6: [ destination-address ]| dns : $s$. | $d$. | $e$. | $u$.] host-name | enum:table -num | loopback:rtp | ras| sip-server} [: port


                    Example:
                    Device(config-dial-peer)# session target ipv6:2001:DB8:0:0:8:800:200C:417A
                     

                    Designates a network-specific address to receive calls from a VoIP or VoIPv6 dial peer.

                     

                    Example: Configuring the Session Target

                    Device(config)# dial-peer voice 29 voip
                    Device(config-dial-peer)# destination-pattern 7777 
                    Device(config-dial-peer)# session target ipv6:2001:DB8:0:0:8:800:200C:417A
                    

                    Configuring SIP Register Support

                    SUMMARY STEPS

                      1.    enable

                      2.    configure terminal

                      3.    sip-ua

                      4.    registrar {dns: address | ipv4: destination-address [: port] | ipv6: destination-address : port] } aor-domain expires seconds [tcp tls] ] type [secondary] [scheme string]

                      5.    retry register retries

                      6.    timers register milliseconds


                    DETAILED STEPS
                       Command or ActionPurpose
                      Step 1 enable


                      Example:
                      Device> enable
                      
                       

                      Enables privileged EXEC mode.

                      • Enter your password if prompted.
                       
                      Step 2 configure terminal


                      Example:
                      Device# configure terminal
                      
                       

                      Enters global configuration mode.

                       
                      Step 3 sip-ua


                      Example:
                      Device(config)# sip-ua
                      
                       

                      Enters SIP user agent configuration mode.

                       
                      Step 4 registrar {dns: address | ipv4: destination-address [: port] | ipv6: destination-address : port] } aor-domain expires seconds [tcp tls] ] type [secondary] [scheme string]


                      Example:
                      Device(config-sip-ua)# registrar ipv6: 2001:DB8::1:20F:F7FF:FE0B:2972 expires 3600 secondary 
                      
                       

                      Enables SIP gateways to register E.164 numbers on behalf of analog telephone voice ports, IP phone virtual voice ports, and SCCP phones with an external SIP proxy or SIP registrar.

                       
                      Step 5 retry register retries


                      Example:
                      Device(config-sip-ua)# retry register 10
                      
                       

                      Configures the total number of SIP register messages that the gateway should send.

                       
                      Step 6 timers register milliseconds


                      Example:
                      Device(config-sip-ua)# timers register 500
                      
                       

                      Configures how long the SIP UA waits before sending register requests.

                       

                      Example: Configuring SIP Register Support

                      Device(config)# sip-ua
                      Device(config-sip-ua)# registrar ipv6: 2001:DB8:0:0:8:800:200C:417A expires 3600 secondary
                      Device(config-sip-ua)# retry register 10
                      Device((config-sip-ua)# timers register 500
                      

                      Configuring Outbound Proxy Server Globally on a SIP Gateway

                      SUMMARY STEPS

                        1.    enable

                        2.    configure terminal

                        3.    voice service voip

                        4.    sip

                        5.    outbound-proxy {ipv4: ipv4-address | ipv6: ipv6-address | dns: host : domain} [: port-number]


                      DETAILED STEPS
                         Command or ActionPurpose
                        Step 1 enable


                        Example:
                        Device> enable
                        
                         

                        Enables privileged EXEC mode.

                        • Enter your password if prompted.
                         
                        Step 2 configure terminal


                        Example:
                        Device# configure terminal
                        
                         

                        Enters global configuration mode.

                         
                        Step 3 voice service voip


                        Example:
                        Device(config)# voice service voip
                        
                         

                        Enters voice service VoIP configuration mode.

                         
                        Step 4 sip


                        Example:
                        Device(config-voi-serv)# sip
                        
                         

                        Enters sip configuration mode.

                         
                        Step 5 outbound-proxy {ipv4: ipv4-address | ipv6: ipv6-address | dns: host : domain} [: port-number]


                        Example:
                        Device(config-serv-sip)#outbound-proxy ipv6: 2001:DB8:0:0:8:800:200C:417A
                        
                         

                        Specifies the SIP outbound proxy globally for a Cisco IOS voice gateway using an IPv6 address.

                         

                        Configuring UDP Checksum

                        SUMMARY STEPS

                          1.    enable

                          2.    configure terminal

                          3.    ipv6 udp checksum [process | cef | none]

                          4.    exit


                        DETAILED STEPS
                           Command or ActionPurpose
                          Step 1 enable


                          Example:
                          Device> enable
                          
                           

                          Enables privileged EXEC mode.

                          • Enter your password if prompted.
                           
                          Step 2 configure terminal


                          Example:
                          Device# configure terminal
                          
                           

                          Enters global configuration mode.

                           
                          Step 3 ipv6 udp checksum [process | cef | none]


                          Example:
                          Device(config)# ipv6 udp checksum process
                           

                          Configures UDP checksum for Cisco UBE so that when you enable UDP checksum, it is computed and added for outgoing media packets. Similarly, disable the command to ignore the checksum calculation.

                          Use the following keywords with the ipv6 udp checksum command:

                          • process: Packets are punted to the process switching path for checksum validation.
                          • cef: The UDP checksum validation is done in the CEF path.
                          • none: UDP checksum validation is not done for received media packets in the CEF path and there is no UDP checksum computation for transmitted media packets.
                           
                          Step 4 exit


                          Example:
                          Device(config)# exit
                           

                          Exits global configuration mode and returns to privileged EXEC mode.

                           

                          Configuring IP Toll Fraud

                          SUMMARY STEPS

                            1.    enable

                            2.    configure terminal

                            3.    voice service voip

                            4.    ip address trusted list

                            5.    ipv6 X:X:X:X::X

                            6.    end


                          DETAILED STEPS
                             Command or ActionPurpose
                            Step 1 enable


                            Example:
                            Device> enable
                            
                             

                            Enables privileged EXEC mode.

                            • Enter your password if prompted.
                             
                            Step 2 configure terminal


                            Example:
                            Device# configure terminal
                            
                             

                            Enters global configuration mode.

                             
                            Step 3 voice service voip


                            Example:
                            Device(config)# voice service voip
                            
                             

                            Enters voice service VoIP configuration mode.

                             
                            Step 4 ip address trusted list


                            Example:
                            Device(config-voi-serv)# ip address trusted list
                            
                             

                            Enters IP address trusted list configuration mode. You can add unique and multiple IP addresses for incoming VoIP (H.323/SIP) calls to a list of trusted IP addresses.

                             
                            Step 5 ipv6 X:X:X:X::X


                            Example:
                            Device(cfg-iptrust-list)# ipv6 2001:DB8::/48
                            
                             

                            Enters IPv6 addresses for toll fraud prevention.

                             
                            Step 6 end


                            Example:
                            Device(cfg-iptrust-list)# end
                            
                             

                            Exits trusted list configuration mode and returns to global configuration mode.

                             

                            Configuring the RTP Port Range for an Interface

                            SUMMARY STEPS

                              1.    enable

                              2.    configure terminal

                              3.    voice service voip

                              4.    allow-connections sip to sip

                              5.    media-address range range

                              6.    rtp-port range range

                              7.    exit

                              8.    dial-peer voice tag voip

                              9.    voice–class sip bind media source–interface interface

                              10.    end


                            DETAILED STEPS
                               Command or ActionPurpose
                              Step 1 enable


                              Example:
                              Device> enable
                              
                               

                              Enables privileged EXEC mode.

                              • Enter your password if prompted.
                               
                              Step 2 configure terminal


                              Example:
                              Device# configure terminal
                              
                               

                              Enters global configuration mode.

                               
                              Step 3 voice service voip


                              Example:
                              Device(config)# voice service voip
                              
                               

                              Enters voice service VoIP configuration mode.

                               
                              Step 4 allow-connections sip to sip


                              Example:
                              Device(conf-voi-serv)# allow-connections sip to sip
                              
                               

                              Allows sip-to-sip connections under voice service voip configuration mode for Cisco UBE.

                               
                              Step 5 media-address range range


                              Example:
                              Device(config-voi-serv)# media-address range 2001:DB8::/48
                              
                               

                              Configures the media-address range, which enables the media gateway to allocate the available free port for a given IP address within the address range.

                               
                              Step 6 rtp-port range range


                              Example:
                              Device(config-voi-serv)# rtp-port range 20000 30000
                              
                               

                              Configures the RTP port range.

                              Note   
                              • Each Cisco UBE can configure ten unique IP address ranges.
                              • The default global RTP port range is from 16384 to 32766.
                               
                              Step 7 exit


                              Example:
                              Device(config-voi-ser)# exit
                              
                               

                              Exits voice service VoIP configuration mode.

                               
                              Step 8 dial-peer voice tag voip


                              Example:
                              Device(config)# dial-peer voice 300 voip
                              
                               

                              Enters dial peer configuration mode.

                               
                              Step 9 voice–class sip bind media source–interface interface


                              Example:
                              Device(config-dial-peer)# voice-class sip bind media source-interface GigabitEthernet 0
                              
                               

                              Matches the local SIP bind media IP address to the IP address range entries. Binds media packets to the IPv4 or IPv6 address of a specific interface and specifies an interface as the source address of SIP packets.

                               
                              Step 10 end


                              Example:
                              Device(config-dial-peer)# end
                              
                               

                              Exits dial peer configuration mode and returns to global configuration mode.

                               

                              Configuring Message Waiting Indicator Server Address

                              SUMMARY STEPS

                                1.    enable

                                2.    configure terminal

                                3.    sip-ua

                                4.    mwi-server {ipv4: destination-address | ipv6: destination-address | dns: host–name} peer-tag [output-dial-peer-tag]

                                5.    end


                              DETAILED STEPS
                                 Command or ActionPurpose
                                Step 1 enable


                                Example:
                                Device> enable
                                
                                 

                                Enables privileged EXEC mode.

                                • Enter your password if prompted.
                                 
                                Step 2 configure terminal


                                Example:
                                Device# configure terminal
                                
                                 

                                Enters global configuration mode.

                                 
                                Step 3 sip-ua


                                Example:
                                Device(config)# sip-ua
                                
                                 

                                Enters SIP user-agent configuration mode.

                                 
                                Step 4mwi-server {ipv4: destination-address | ipv6: destination-address | dns: host–name} peer-tag [output-dial-peer-tag]

                                Example:
                                Device(config-sip-ua)# mwi-server ipv6 2001:DB8::/48 peer-tag 3
                                
                                 
                                Configures voice-mail server settings on a voice gateway or user agent.
                                • ipv4/ ipv6: destination-address—IP address of the voice-mail server.
                                • dns: host-name—Host device housing the domain name server that resolves the name of the voice-mail server. The argument should contain the complete hostname to be associated with the target address; for example, dns:test.example.com.
                                • peer-tag—Attaches an existing dial peer to SIP MWI service.
                                 
                                Step 5 end


                                Example:
                                Device(config-sip-ua)# end
                                
                                 

                                Exits SIP user-agent configuration mode and returns to global configuration mode.

                                 

                                Configuring Voice Ports

                                SUMMARY STEPS

                                  1.    enable

                                  2.    configure terminal

                                  3.    voice-port port number

                                  4.    vmwi [fsk | dc-voltage]

                                  5.    end


                                DETAILED STEPS
                                   Command or ActionPurpose
                                  Step 1 enable


                                  Example:
                                  Device> enable
                                  
                                   

                                  Enables privileged EXEC mode.

                                  • Enter your password if prompted.
                                   
                                  Step 2 configure terminal


                                  Example:
                                  Device# configure terminal
                                  
                                   

                                  Enters global configuration mode.

                                   
                                  Step 3 voice-port port number


                                  Example:
                                  Device(config)# voice-port 3
                                  
                                   

                                  Enters voiceport configuration mode.

                                   
                                  Step 4vmwi [fsk | dc-voltage]


                                  Example:
                                  Device(config-voiceport)# vmwi fsk
                                  
                                   

                                  Enables either Frequency–Shift Keying (FSK) visible message waiting indication (VMWI) or DC voltage on a Cisco VG224 onboard analog FXS voice port. VMWI is configured automatically when MWI is configured on the voice port.

                                  • If an FSK phone is connected to the voice port, use the fsk keyword. Similarly, if a DC voltage phone is connected to the voice port, use the dc–voltage keyword.
                                   
                                  Step 5 end


                                  Example:
                                  Device(config-voiceport)# end
                                  
                                   

                                  Exits voice-port configuration mode and returns to privileged EXEC mode.

                                   

                                  Configuring Cisco UBE Mid-call Re-INVITE Consumption

                                  Configuring Passthrough SIP Messages at the Global Level

                                  Perform this task to configure passthrough SIP messages at the global level:

                                  SUMMARY STEPS

                                    1.    enable

                                    2.    configure terminal

                                    3.    voice service voip

                                    4.    sip

                                    5.    midcall-signaling passthru media-change

                                    6.    exit


                                  DETAILED STEPS
                                     Command or ActionPurpose
                                    Step 1 enable


                                    Example:
                                    Device> enable
                                     

                                    Enables privileged EXEC mode.

                                    • Enter your password if prompted.
                                     
                                    Step 2 configure terminal


                                    Example:
                                    Device# configure terminal
                                     

                                    Enters global configuration mode.

                                     
                                    Step 3 voice service voip


                                    Example:
                                    Device(config)# voice service voip
                                     

                                    Enters voice service VoIP configuration mode.

                                     
                                    Step 4 sip


                                    Example:
                                    Device(conf-voi-serv)# sip
                                     

                                    Enters voice service VoIP SIP configuration mode.

                                     
                                    Step 5 midcall-signaling passthru media-change


                                    Example:
                                    Device(conf-serv-sip)# midcall-signaling passthru media-change
                                     

                                    Passes through SIP messages that involve media change.

                                     
                                    Step 6 exit


                                    Example:
                                    Device(conf-serv-sip)# exit
                                     

                                    Exits voice service SIP configuration mode and returns to global configuration mode.

                                     

                                    Configuring Passthrough SIP Messages at Dial Peer Level

                                    Perform this task to configure passthrough SIP messages at the dial-peer level. You need to perform this task at the dial-peer level to consume all media-related mid-call Re-INVITEs/UPDATEs.


                                    Note


                                    If the Cisco UBE Mid-call Re-INVITE/UPDATE consumption feature is configured on global and dial-peer level, dial-peer level takes precedence.


                                    SUMMARY STEPS

                                      1.    enable

                                      2.    configure terminal

                                      3.    dial-peer voice dial-peer tag voip

                                      4.    voice-class sip mid-call signaling passthru media-change

                                      5.    exit


                                    DETAILED STEPS
                                       Command or ActionPurpose
                                      Step 1 enable


                                      Example:
                                      Device> enable
                                       

                                      Enables privileged EXEC mode.

                                      • Enter your password if prompted.
                                       
                                      Step 2 configure terminal


                                      Example:
                                      Device# configure terminal
                                       

                                      Enters global configuration mode.

                                       
                                      Step 3 dial-peer voice dial-peer tag voip


                                      Example:
                                      Device(config)# dial-peer voice  2  voip
                                       

                                      Enters dial-peer voice configuration mode.

                                       
                                      Step 4 voice-class sip mid-call signaling passthru media-change


                                      Example:
                                      Device(config-dial-peer)# voice-class sip mid-call signaling passthru media-change
                                       

                                      Passes through SIP messages that involve media change.

                                       
                                      Step 5 exit


                                      Example:
                                      Device(config-dial-peer)# exit
                                       

                                      Exits dial-peer voice configuration mode and returns to global configuration mode.

                                       

                                      Configuring H.323 IPv4-to-SIPv6 Connections in a Cisco UBE

                                      An organization with an IPv4 network can deploy a Cisco UBE on the boundary to connect with the service provider’s IPv6 network (see the figure below).

                                      Figure 4. Cisco UBE Interoperating IPv4 Networks with IPv6 Service Provider

                                      A Cisco UBE can interoperate between H.323/SIP IPv4 and SIP IPv6 networks in media flow-through mode. In media flow-through mode, both signaling and media flows through the Cisco UBE, and the Cisco UBE performs both signaling and media interoperation between H.323/SIP IPv4 and SIP IPv6 networks (see the figure below).

                                      Figure 5. IPv4 to IPv6 Media Interoperating Through Cisco IOS MTP

                                      The Cisco UBE feature adds IPv6 capability to existing VoIP features. This feature adds dual-stack support on voice gateways and MTP, IPv6 support for SIP trunks, and SCCP-controlled analog voice gateways. In addition, the SBC functionality of connecting SIP IPv4 or H.323 IPv4 network to a SIP IPv6 network is implemented on an Cisco UBE to facilitate migration from VoIPv4 to VoIPv6.

                                      Before You Begin

                                      Cisco UBE must be configured in IPv6-only or dual-stack mode to support IPv6 calls.


                                      Note


                                      A Cisco UBE interoperates between H.323/SIP IPv4 and SIP IPv6 networks only in media flow-through mode.


                                      SUMMARY STEPS

                                        1.    enable

                                        2.    configure terminal

                                        3.    voice service voip

                                        4.    allow-connections from type to to type


                                      DETAILED STEPS
                                         Command or ActionPurpose
                                        Step 1 enable


                                        Example:
                                        Device> enable
                                         

                                        Enables privileged EXEC mode.

                                        • Enter your password if prompted.
                                         
                                        Step 2 configure terminal


                                        Example:
                                        Device# configure terminal
                                         

                                        Enters global configuration mode.

                                         
                                        Step 3 voice service voip


                                        Example:
                                        Device(config)# voice service voip
                                         

                                        Enters voice service VoIP configuration mode.

                                         
                                        Step 4 allow-connections from type to to type


                                        Example:
                                        Device(config-voi-serv)# allow-connections h323 to sip
                                         

                                        Allows connections between specific types of endpoints in a VoIPv6 network.

                                        Arguments are as follows:

                                        • from-type --Type of connection. Valid values: h323, sip.
                                        • to-type --Type of connection. Valid values: h323, sip.
                                         

                                        Example: Configuring H.323 IPv4-to-SIPv6 Connections in a Cisco UBE

                                        Device(config)# voice service voip
                                        Device(config-voi-serv)# allow-connections h323 to sip

                                        Configuration Examples for VoIP over IPv6

                                        Example: Configuring the SIP Trunk

                                        This example shows how to configure the SIP trunk to use dual-stack mode, with IPv6 as the preferred mode. The SIP service must be shut down before any changes are made to protocol mode configuration.

                                        Device(config)# sip-ua
                                        Device(config-sip-ua)# protocol mode dual-stack preference ipv6
                                        

                                        Troubleshooting Tips for VoIP for IPv6

                                        Media Flow-Through

                                        To enable all Session Initiation Protocol (SIP)-related debugging, use the debug ccsip all command in privileged EXEC mode.

                                        To trace the execution path through the call control application programming interface (CCAPI), use the debug voip ccapi inout command.

                                        Media Flow-Around

                                        To enable all Session Initiation Protocol (SIP)-related debugging, use the debug ccsip all command.

                                        To trace the execution path through the call control application programming interface (CCAPI), use the debug voip ccapi inout command.

                                        SDP Pass-Through

                                        To enable all Session Initiation Protocol (SIP)-related debugging (when the call is active in Pass through mode), use the debug ccsip all command.

                                        RTP Port Range

                                        To enable all Session Initiation Protocol (SIP)-related debugging, use the debug ccsip all command.

                                        To enable debugging for Real-Time Transport Protocol (RTP) named event packets, use the debug voip rtp command.

                                        VMWI SIP

                                        To collect debug information only for signaling events, use the debug vpm signal command.

                                        To show all Session Initiation Protocol (SIP) Service Provider Interface (SPI) message tracing, use the debug ccsip messages command.

                                        Verifying and Troubleshooting Tips

                                        Verifying Cisco UBE ANAT Call Flows

                                        To verify that media settings are enabled in the media flowthrough and media flow-around feature, use the following commands:

                                        SUMMARY STEPS

                                          1.    show call active voice brief

                                          2.    show call active voice compact

                                          3.    show voip rtp connections


                                        DETAILED STEPS
                                          Step 1   show call active voice brief


                                          Example:
                                          Device# show call active voice brief
                                          
                                          <ID>: <CallID> <start>ms.<index> (<start>) +<connect> pid:<peer_id> <dir> <addr> <state>
                                            dur hh:mm:ss tx:<packets>/<bytes> rx:<packets>/<bytes> dscp:<packets violation> media:<packets violation> audio tos:<audio tos value> video tos:<video tos value>
                                           IP <ip>:<udp> rtt:<time>ms pl:<play>/<gap>ms lost:<lost>/<early>/<late>
                                            delay:<last>/<min>/<max>ms <codec> <textrelay> <transcoded
                                          
                                           media inactive detected:<y/n> media cntrl rcvd:<y/n> timestamp:<time>
                                          
                                           long duration call detected:<y/n> long duration call duration :<sec> timestamp:<time>
                                           LostPacketRate:<%> OutOfOrderRate:<%>
                                            MODEMPASS <method> buf:<fills>/<drains> loss <overall%> <multipkt>/<corrected>
                                             last <buf event time>s dur:<Min>/<Max>s
                                           FR <protocol> [int dlci cid] vad:<y/n> dtmf:<y/n> seq:<y/n>
                                            <codec> (payload size)
                                           ATM <protocol> [int vpi/vci cid] vad:<y/n> dtmf:<y/n> seq:<y/n>
                                            <codec> (payload size)
                                           Tele <int> (callID) [channel_id] tx:<tot>/<v>/<fax>ms <codec> noise:<l> acom:<l> i/o:<l>/<l> dBm
                                            MODEMRELAY info:<rcvd>/<sent>/<resent> xid:<rcvd>/<sent> total:<rcvd>/<sent>/<drops>
                                                   speeds(bps): local <rx>/<tx> remote <rx>/<tx>
                                           Proxy <ip>:<audio udp>,<video udp>,<tcp0>,<tcp1>,<tcp2>,<tcp3> endpt: <type>/<manf>
                                           bw: <req>/<act> codec: <audio>/<video>
                                            tx: <audio pkts>/<audio bytes>,<video pkts>/<video bytes>,<t120 pkts>/<t120 bytes>
                                           rx: <audio pkts>/<audio bytes>,<video pkts>/<video bytes>,<t120 pkts>/<t120 bytes>
                                          
                                          Telephony call-legs: 0
                                          SIP call-legs: 2
                                          H323 call-legs: 0
                                          Call agent controlled call-legs: 0
                                          SCCP call-legs: 0
                                          Multicast call-legs: 0
                                          Total call-legs: 2
                                          0    : 987 361904110ms.1 (16:01:10.557 IST Tue May 14 2013) +530 pid:1 Answer 1005 connected
                                           dur 00:00:56 tx:1082/173120 rx:1141/182560 dscp:0 media:0 audio tos:0xB8 video tos:0x0
                                           IP 2001:1111:2222:3333:4444:5555:6666:1012:38356 SRTP: off rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g711ulaw TextRelay: off Transcoded: No
                                           media inactive detected:n media contrl rcvd:n/a timestamp:n/a
                                           long duration call detected:n long duration call duration:n/a timestamp:n/a
                                           LostPacketRate:0.00 OutOfOrderRate:0.00
                                          
                                          0    : 988 361904120ms.1 (16:01:10.567 IST Tue May 14 2013) +510 pid:2 Originate 2005 connected
                                           dur 00:00:56 tx:1141/182560 rx:1082/173120 dscp:0 media:0 audio tos:0xB8 video tos:0x0
                                           IP 2001:1111:2222:3333:4444:5555:6666:1012:26827 SRTP: off rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g711ulaw TextRelay: off Transcoded: No
                                           media inactive detected:n media contrl rcvd:n/a timestamp:n/a
                                           long duration call detected:n long duration call duration:n/a timestamp:n/a
                                           LostPacketRate:0.00 OutOfOrderRate:0.00
                                          
                                          Telephony call-legs: 0
                                          SIP call-legs: 2
                                          H323 call-legs: 0
                                          Call agent controlled call-legs: 0
                                          SCCP call-legs: 0
                                          Multicast call-legs: 0
                                          Total call-legs: 2
                                          
                                          -------------------------------------------------------------------------
                                          
                                          Step 2   show call active voice compact


                                          Example:
                                          Device# show call active voice compact
                                          
                                           <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
                                          Total call-legs: 2
                                                 987 ANS     T61    g711ulaw    VOIP        P1005 2001:......:1012:38356
                                                 988 ORG     T61    g711ulaw    VOIP        P2005 2001:......:1012:26827
                                          
                                          Step 3   show voip rtp connections


                                          Example:
                                          Device# show voip rtp connections
                                          
                                          VoIP RTP Port Usage Information:
                                          Max Ports Available: 24273, Ports Reserved: 303, Ports in Use: 2   
                                          Port range not configured, Min: 16384, Max: 32767   
                                                                                          Ports       Ports       Ports
                                          Media-Address Range                             Available   Reserved    In-use
                                          
                                          Default Address-Range                           8091        101         0
                                          2001::
                                          2002::                                          8091        101         1
                                          9.0.0.0              10.0.0.0                   8091        101         1
                                          Found 2 active RTP connections
                                          
                                          

                                          Verifying and Troubleshooting Cisco UBE ANAT Flow-Through Call

                                          To verify and troubleshoot Cisco UBE ANAT Flow-Through calls, use the following commands:

                                          SUMMARY STEPS

                                            1.    debug ccsip message

                                            2.    show voip rtp connections


                                          DETAILED STEPS
                                            Step 1   debug ccsip message


                                            Example:
                                            Device# show logging
                                            
                                            *Jun  7 09:17:41.135: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
                                            Received: 
                                            INVITE sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060 SIP/2.0
                                            Via: SIP/2.0/UDP [2001:DB8:C18:2:219:2FFF:FE89:7928]:5060;branch=z9hG4bK1CA8CD
                                            Remote-Party-ID: <sip:1001@[2001:DB8:C18:2:219:2FFF:FE89:7928]>;party=calling;screen=no;privacy=off
                                            From: <sip:1001@[2001:DB8:C18:2:219:2FFF:FE89:7928]>;tag=6EDAC1D0-F25
                                            To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>
                                            Date: Thu, 07 Jun 2012 10:47:17 GMT
                                            Call-ID: FC36AC29-AFC411E1-8725FA39-34B6D876@2001:DB8:C18:2:219:2FFF:FE89:7928
                                            Supported: 100rel,timer,resource-priority,replaces
                                            Require: sdp-anat
                                            Min-SE:  1800
                                            Cisco-Guid: 4231321369-2948862433-2168455193-0797538600
                                            User-Agent: Cisco-SIPGateway/IOS-12.x
                                            Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                            CSeq: 101 INVITE
                                            Max-Forwards: 70
                                            Timestamp: 1339066037
                                            Contact: <sip:1001@[2001:DB8:C18:2:219:2FFF:FE89:7928]:5060>
                                            Expires: 180
                                            Allow-Events: telephone-event
                                            Content-Type: application/sdp
                                            Content-Disposition: session;handling=required
                                            Content-Length: 441
                                            
                                            v=0
                                            o=CiscoSystemsSIP-GW-UserAgent 4604 5397 IN IP6 2001:DB8:C18:2:219:2FFF:FE89:7928
                                            s=SIP Call
                                            c=IN IP4 9.44.30.10
                                            t=0 0
                                            a=group:ANAT 1 2
                                            m=audio 16970 RTP/AVP 18 19
                                            c=IN IP4 9.44.30.10
                                            a=mid:1
                                            a=rtpmap:18 G729/8000
                                            a=fmtp:18 annexb=no
                                            a=rtpmap:19 CN/8000
                                            a=ptime:20
                                            m=audio 17066 RTP/AVP 18 19
                                            c=IN IP6 2001:DB8:C18:2:219:2FFF:FE89:7928
                                            a=mid:2
                                            a=rtpmap:18 G729/8000
                                            a=fmtp:18 annexb=no
                                            a=rtpmap:19 CN/8000
                                            a=ptime:20
                                            
                                            *Jun  7 09:17:41.159: //31/FC34D7198140/SIP/Msg/ccsipDisplayMsg:
                                            Sent: 
                                            SIP/2.0 100 Trying
                                            Via: SIP/2.0/UDP [2001:DB8:C18:2:219:2FFF:FE89:7928]:5060;branch=z9hG4bK1CA8CD
                                            From: <sip:1001@[2001:DB8:C18:2:219:2FFF:FE89:7928]>;tag=6EDAC1D0-F25
                                            To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>
                                            Date: Thu, 07 Jun 2012 09:17:41 GMT
                                            Call-ID: FC36AC29-AFC411E1-8725FA39-34B6D876@2001:DB8:C18:2:219:2FFF:FE89:7928
                                            Timestamp: 1339066037
                                            CSeq: 101 INVITE
                                            Allow-Events: telephone-event
                                            Server: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                            Content-Length: 0
                                            
                                            *Jun  7 09:17:41.159: //32/FC34D7198140/SIP/Msg/ccsipDisplayMsg:
                                            Sent: 
                                            INVITE sip:6000@9.44.30.11:5060 SIP/2.0
                                            Via: SIP/2.0/UDP 9.44.30.14:5060;branch=z9hG4bK2688E
                                            Remote-Party-ID: <sip:1001@9.44.30.14>;party=calling;screen=no;privacy=off
                                            From: <sip:1001@9.44.30.14>;tag=6D0FC0-1428
                                            To: <sip:6000@9.44.30.11>
                                            Date: Thu, 07 Jun 2012 09:17:41 GMT
                                            Call-ID: 7780227E-AFB811E1-8060F4DD-5665AA1B@9.44.30.14
                                            Supported: timer,resource-priority,replaces
                                            Require: sdp-anat
                                            Min-SE:  1800
                                            Cisco-Guid: 4231321369-2948862433-2168455193-0797538600
                                            User-Agent: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                            Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                            CSeq: 101 INVITE
                                            Timestamp: 1339060661
                                            Contact: <sip:1001@9.44.30.14:5060>
                                            Expires: 180
                                            Allow-Events: telephone-event
                                            Max-Forwards: 69
                                            Content-Type: application/sdp
                                            Content-Disposition: session;handling=required   Phone is offhook
                                            Content-Length: 437
                                            
                                            v=0
                                            o=CiscoSystemsSIP-GW-UserAgent 3184 51 IN IP4 9.44.30.14
                                            s=SIP Call
                                            c=IN IP6 2001:DB8:C18:2:223:4FF:FEAC:4540
                                            t=0 0
                                            a=group:ANAT 1 2
                                            m=audio 16438 RTP/AVP 18 19
                                            c=IN IP6 2001:DB8:C18:2:223:4FF:FEAC:4540
                                            a=mid:1
                                            a=rtpmap:18 G729/8000
                                            a=fmtp:18 annexb=no
                                            a=rtpmap:19 CN/8000
                                            a=ptime:20
                                            m=audio 16440 RTP/AVP 18 19
                                            c=IN IP4 9.44.30.14
                                            a=mid:2
                                            a=rtpmap:18 G729/8000
                                            a=fmtp:18 annexb=no
                                            a=rtpmap:19 CN/8000
                                            a=ptime:20
                                            
                                            *Jun  7 09:17:41.179: //32/FC34D7198140/SIP/Msg/ccsipDisplayMsg:
                                            Received: 
                                            SIP/2.0 100 Trying
                                            Via: SIP/2.0/UDP 9.44.30.14:5060;branch=z9hG4bK2688E
                                            From: <sip:1001@9.44.30.14>;tag=6D0FC0-1428
                                            To: <sip:6000@9.44.30.11>
                                            Date: Thu, 07 Jun 2012 10:40:14 GMT
                                            Call-ID: 7780227E-AFB811E1-8060F4DD-5665AA1B@9.44.30.14
                                            Timestamp: 1339060661
                                            CSeq: 101 INVITE
                                            Allow-Events: telephone-event
                                            Server: Cisco-SIPGateway/IOS-15.2.2.5.T
                                            Content-Length: 0
                                            
                                            *Jun  7 09:17:41.203: //32/FC34D7198140/SIP/Msg/ccsipDisplayMsg:
                                            Received: 
                                            SIP/2.0 180 Ringing
                                            Via: SIP/2.0/UDP 9.44.30.14:5060;branch=z9hG4bK2688E
                                            From: <sip:1001@9.44.30.14>;tag=6D0FC0-1428
                                            To: <sip:6000@9.44.30.11>;tag=93D1F9D4-9E2
                                            Date: Thu, 07 Jun 2012 10:40:14 GMT
                                            Call-ID: 7780227E-AFB811E1-8060F4DD-5665AA1B@9.44.30.14
                                            Timestamp: 1339060661
                                            CSeq: 101 INVITE
                                            Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                            Allow-Events: telephone-event
                                            Remote-Party-ID: <sip:6000@9.44.30.11>;party=called;screen=no;privacy=off
                                            Contact: <sip:6000@9.44.30.11:5060>
                                            Server: Cisco-SIPGateway/IOS-15.2.2.5.T
                                            Content-Length: 0
                                            
                                            *Jun  7 09:17:41.207: //31/FC34D7198140/SIP/Msg/ccsipDisplayMsg:
                                            Sent: 
                                            SIP/2.0 180 Ringing
                                            Via: SIP/2.0/UDP [2001:DB8:C18:2:219:2FFF:FE89:7928]:5060;branch=z9hG4bK1CA8CD
                                            From: <sip:1001@[2001:DB8:C18:2:219:2FFF:FE89:7928]>;tag=6EDAC1D0-F25
                                            To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=6D0FF4-14D3
                                            Date: Thu, 07 Jun 2012 09:17:41 GMT
                                            Call-ID: FC36AC29-AFC411E1-8725FA39-34B6D876@2001:DB8:C18:2:219:2FFF:FE89:7928
                                            Timestamp: 1339066037
                                            CSeq: 101 INVITE
                                            Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                            Allow-Events: telephone-event
                                            Remote-Party-ID: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;party=called;screen=no;privacy=off
                                            Contact: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060>
                                            Server: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                            Content-Length: 0
                                            
                                            
                                            *Jun  7 09:17:41.219: //32/FC34D7198140/SIP/Msg/ccsipDisplayMsg:
                                            Received: 
                                            SIP/2.0 200 OK
                                            Via: SIP/2.0/UDP 9.44.30.14:5060;branch=z9hG4bK2688E
                                            From: <sip:1001@9.44.30.14>;tag=6D0FC0-1428
                                            To: <sip:6000@9.44.30.11>;tag=93D1F9D4-9E2
                                            Date: Thu, 07 Jun 2012 10:40:14 GMT
                                            Call-ID: 7780227E-AFB811E1-8060F4DD-5665AA1B@9.44.30.14
                                            Timestamp: 1339060661
                                            CSeq: 101 INVITE
                                            Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                            Allow-Events: telephone-event
                                            Remote-Party-ID: <sip:6000@9.44.30.11>;party=called;screen=no;privacy=off
                                            Contact: <sip:6000@9.44.30.11:5060>
                                            Supported: replaces
                                            Require: sdp-anat
                                            Server: Cisco-SIPGateway/IOS-15.2.2.5.T
                                            Supported: timer
                                            Content-Type: application/sdp
                                            Content-Disposition: session;handling=required
                                            Content-Length: 435
                                            
                                            v=0
                                            o=CiscoSystemsSIP-GW-UserAgent 8213 2783 IN IP4 9.44.30.11
                                            s=SIP Call
                                            c=IN IP6 2001:DB8:C18:2:217:59FF:FEDE:8898
                                            t=0 0
                                            a=group:ANAT 1
                                            m=audio 17200 RTP/AVP 18 19
                                            c=IN IP6 2001:DB8:C18:2:217:59FF:FEDE:8898
                                            a=mid:1
                                            a=rtpmap:18 G729/8000
                                            a=fmtp:18 annexb=no
                                            a=rtpmap:19 CN/8000
                                            a=ptime:20
                                            m=audio 0 RTP/AVP 18 19
                                            c=IN IP4 9.44.30.11
                                            a=mid:2
                                            a=rtpmap:18 G729/8000
                                            a=fmtp:18 annexb=no
                                            a=rtpmap:19 CN/8000
                                            a=ptime:20
                                            
                                            
                                            *Jun  7 09:17:41.227: //32/FC34D7198140/SIP/Msg/ccsipDisplayMsg:
                                            Sent: 
                                            ACK sip:6000@9.44.30.11:5060 SIP/2.0
                                            Via: SIP/2.0/UDP 9.44.30.14:5060;branch=z9hG4bK27145B
                                            From: <sip:1001@9.44.30.14>;tag=6D0FC0-1428
                                            To: <sip:6000@9.44.30.11>;tag=93D1F9D4-9E2
                                            Date: Thu, 07 Jun 2012 09:17:41 GMT
                                            Call-ID: 7780227E-AFB811E1-8060F4DD-5665AA1B@9.44.30.14
                                            Max-Forwards: 70
                                            CSeq: 101 ACK
                                            Allow-Events: telephone-event
                                            Content-Length: 0
                                            
                                            
                                            *Jun  7 09:17:41.235: //31/FC34D7198140/SIP/Msg/ccsipDisplayMsg:
                                            Sent: 
                                            SIP/2.0 200 OK
                                            Via: SIP/2.0/UDP [2001:DB8:C18:2:219:2FFF:FE89:7928]:5060;branch=z9hG4bK1CA8CD
                                            From: <sip:1001@[2001:DB8:C18:2:219:2FFF:FE89:7928]>;tag=6EDAC1D0-F25
                                            To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=6D0FF4-14D3
                                            Date: Thu, 07 Jun 2012 09:17:41 GMT
                                            Call-ID: FC36AC29-AFC411E1-8725FA39-34B6D876@2001:DB8:C18:2:219:2FFF:FE89:7928
                                            Timestamp: 1339066037
                                            CSeq: 101 INVITE
                                            Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                            Allow-Events: telephone-event
                                            Remote-Party-ID: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;party=called;screen=no;privacy=off
                                            Contact: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060>
                                            Supported: replaces
                                            Require: sdp-anat
                                            Server: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                            Supported: timer
                                            Content-Type: application/sdp
                                            Content-Disposition: session;handling=required
                                            Content-Length: 433
                                            
                                            v=0
                                            o=CiscoSystemsSIP-GW-UserAgent 8884 4606 IN IP6 2001:DB8:C18:2:223:4FF:FEAC:4540
                                            s=SIP Call
                                            c=IN IP4 9.44.30.14
                                            t=0 0
                                            a=group:ANAT 1
                                            m=audio 16436 RTP/AVP 18 19
                                            c=IN IP4 9.44.30.14
                                            a=mid:1
                                            a=rtpmap:18 G729/8000
                                            a=fmtp:18 annexb=no
                                            a=rtpmap:19 CN/8000
                                            a=ptime:20
                                            m=audio 0 RTP/AVP 18 19
                                            c=IN IP6 2001:DB8:C18:2:223:4FF:FEAC:4540
                                            a=mid:2
                                            a=rtpmap:18 G729/8000
                                            a=fmtp:18 annexb=no
                                            a=rtpmap:19 CN/8000
                                            a=ptime:20
                                            
                                            *Jun  7 09:17:41.251: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
                                            Received: 
                                            ACK sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060 SIP/2.0
                                            Via: SIP/2.0/UDP [2001:DB8:C18:2:219:2FFF:FE89:7928]:5060;branch=z9hG4bK1CB1E77
                                            From: <sip:1001@[2001:DB8:C18:2:219:2FFF:FE89:7928]>;tag=6EDAC1D0-F25
                                            To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=6D0FF4-14D3
                                            Date: Thu, 07 Jun 2012 10:47:17 GMT
                                            Call-ID: FC36AC29-AFC411E1-8725FA39-34B6D876@2001:DB8:C18:2:219:2FFF:FE89:7928
                                            Max-Forwards: 70
                                            CSeq: 101 ACK
                                            Allow-Events: telephone-event
                                            Content-Length: 0
                                            
                                            Step 2   show voip rtp connections


                                            Example:
                                            Device# show voip rtp connections
                                            
                                            VoIP RTP Port Usage Information:
                                            Max Ports Available: 8091, Ports Reserved: 101, Ports in Use: 3
                                            Port range not configured, Min: 16384, Max: 32767
                                            
                                                                                    Ports       Ports       Ports     
                                            Media-Address Range                     Available   Reserved    In-use    
                                            
                                            Default Address-Range                   8091        101         3         
                                            
                                            VoIP RTP active connections :
                                            No. CallId     dstCallId  LocalRTP RmtRTP LocalIP                                RemoteIP                               
                                            1     31         32         16436    16970  9.44.30.14                             9.44.30.10                             
                                            2     32         31         16438    17200  2001:DB8:C18:2:223:4FF:FEAC:4540       2001:DB8:C18:2:217:59FF:FEDE:8898      
                                            Found 2 active RTP connections
                                            
                                            

                                            Verifying Cisco UBE ANAT Flow-Around Calls

                                            To verify Cisco UBE ANAT Flow-Around calls, use the debug ccsip message commands:

                                            SUMMARY STEPS

                                              1.    debug ccsip message

                                              2.    show voip rtp connections


                                            DETAILED STEPS
                                              Step 1   debug ccsip message


                                              Example:
                                              Device# Show logging
                                              
                                              *Jun  7 17:26:30.681: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
                                              Received: 
                                              INVITE sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060 SIP/2.0
                                              Via: SIP/2.0/UDP [2001:DB8:C18:2:223:33FF:FEB1:B440]:5060;branch=z9hG4bK14B25D
                                              Remote-Party-ID: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;party=calling;screen=no;privacy=off
                                              From: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;tag=5569ECC8-C79
                                              To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>
                                              Date: Thu, 07 Jun 2012 17:35:05 GMT
                                              Call-ID: F44F5437-AFFD11E1-816CD9DB-F669887E@2001:DB8:C18:2:223:33FF:FEB1:B440
                                              Supported: 100rel,timer,resource-priority,replaces
                                              Require: sdp-anat
                                              Min-SE:  1800
                                              Cisco-Guid: 1170397766-2953384417-2170945561-0797538600
                                              User-Agent: Cisco-SIPGateway/IOS-12.x
                                              Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                              CSeq: 101 INVITE
                                              Max-Forwards: 70
                                              Timestamp: 1339090505
                                              Contact: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]:5060>
                                              Expires: 180
                                              Allow-Events: telephone-event
                                              Content-Type: application/sdp
                                              Content-Disposition: session;handling=required
                                              Content-Length: 465
                                              
                                              v=0
                                              o=CiscoSystemsSIP-GW-UserAgent 9103 1209 IN IP6 2001:DB8:C18:2:223:33FF:FEB1:B440
                                              s=SIP Call
                                              c=IN IP4 9.44.30.13
                                              t=0 0
                                              a=group:ANAT 1 2
                                              m=audio 18706 RTP/AVP 18 0 19
                                              c=IN IP4 9.44.30.13
                                              a=mid:1
                                              a=rtpmap:18 G729/8000
                                              a=fmtp:18 annexb=no
                                              a=rtpmap:0 PCMU/8000
                                              a=rtpmap:19 CN/8000
                                              m=audio 16384 RTP/AVP 18 0 19
                                              c=IN IP6 2001:DB8:C18:2:223:33FF:FEB1:B440
                                              a=mid:2
                                              a=rtpmap:18 G729/8000
                                              a=fmtp:18 annexb=no
                                              a=rtpmap:0 PCMU/8000
                                              a=rtpmap:19 CN/8000
                                              
                                              
                                              *Jun  7 17:26:30.705: //106/45C2DA468166/SIP/Msg/ccsipDisplayMsg:
                                              Sent: 
                                              SIP/2.0 100 Trying
                                              Via: SIP/2.0/UDP [2001:DB8:C18:2:223:33FF:FEB1:B440]:5060;branch=z9hG4bK14B25D
                                              From: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;tag=5569ECC8-C79
                                              To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>
                                              Date: Thu, 07 Jun 2012 17:26:30 GMT
                                              Call-ID: F44F5437-AFFD11E1-816CD9DB-F669887E@2001:DB8:C18:2:223:33FF:FEB1:B440
                                              Timestamp: 1339090505
                                              CSeq: 101 INVITE
                                              Allow-Events: telephone-event
                                              Server: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                              Content-Length: 0
                                              
                                              
                                              *Jun  7 17:26:30.705: //107/45C2DA468166/SIP/Msg/ccsipDisplayMsg:
                                              Sent: 
                                              INVITE sip:6000@9.44.30.11:5060 SIP/2.0
                                              Via: SIP/2.0/UDP 9.44.30.14:5060;branch=z9hG4bK90BB
                                              Remote-Party-ID: <sip:1001@9.44.30.14>;party=calling;screen=no;privacy=off
                                              From: <sip:1001@9.44.30.14>;tag=22C984C-970
                                              To: <sip:6000@9.44.30.11>
                                              Date: Thu, 07 Jun 2012 17:26:30 GMT
                                              Call-ID: C145AF07-AFFC11E1-813EF4DD-5665AA1B@9.44.30.14
                                              Supported: timer,resource-priority,replaces
                                              Require: sdp-anat
                                              Min-SE:  1800
                                              Cisco-Guid: 1170397766-2953384417-2170945561-0797538600
                                              User-Agent: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                              Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                              CSeq: 101 INVITE
                                              Timestamp: 1339089990
                                              Contact: <sip:1001@9.44.30.14:5060>
                                              Expires: 180
                                              Allow-Events: telephone-event
                                              Max-Forwards: 69
                                              Content-Type: application/sdp
                                              Content-Disposition: session;handling=required
                                              Content-Length: 418
                                              
                                              v=0
                                              o=CiscoSystemsSIP-GW-UserAgent 9582 2407 IN IP4 9.44.30.14
                                              s=SIP Call
                                              c=IN IP4 9.44.30.13
                                              t=0 0
                                              a=group:ANAT 1 2
                                              m=audio 18706 RTP/AVP 18 19
                                              c=IN IP4 9.44.30.13
                                              a=mid:1
                                              a=rtpmap:18 G729/8000
                                              a=fmtp:18 annexb=no
                                              a=rtpmap:19 CN/8000
                                              a=ptime:20
                                              m=audio 16384 RTP/AVP 18 19
                                              c=IN IP6 2001:DB8:C18:2:223:33FF:FEB1:B440
                                              a=mid:2
                                              a=rtpmap:18 G729/8000
                                              a=fmtp:18 annexb=no
                                              a=rtpmap:19 CN/8000
                                              a=ptime:20
                                              
                                              *Jun  7 17:26:30.729: //107/45C2DA468166/SIP/Msg/ccsipDisplayMsg:
                                              Received: 
                                              SIP/2.0 100 Trying
                                              Via: SIP/2.0/UDP 9.44.30.14:5060;branch=z9hG4bK90BB
                                              From: <sip:1001@9.44.30.14>;tag=22C984C-970
                                              To: <sip:6000@9.44.30.11>
                                              Date: Thu, 07 Jun 2012 18:49:04 GMT
                                              Call-ID: C145AF07-AFFC11E1-813EF4DD-5665AA1B@9.44.30.14
                                              Timestamp: 1339089990
                                              CSeq: 101 INVITE
                                              Allow-Events: telephone-event
                                              Server: Cisco-SIPGateway/IOS-15.2.2.5.T
                                              Content-Length: 0
                                              
                                              
                                              *Jun  7 17:26:30.753: //107/45C2DA468166/SIP/Msg/ccsipDisplayMsg:
                                              Received: 
                                              SIP/2.0 180 Ringing
                                              Via: SIP/2.0/UDP 9.44.30.14:5060;branch=z9hG4bK90BB
                                              From: <sip:1001@9.44.30.14>;tag=22C984C-970
                                              To: <sip:6000@9.44.30.11>;tag=959183D0-2073
                                              Date: Thu, 07 Jun 2012 18:49:04 GMT
                                              Call-ID: C145AF07-AFFC11E1-813EF4DD-5665AA1B@9.44.30.14
                                              Timestamp: 1339089990
                                              CSeq: 101 INVITE
                                              Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                              Allow-Events: telephone-event
                                              Remote-Party-ID: <sip:6000@9.44.30.11>;party=called;screen=no;privacy=off
                                              Contact: <sip:6000@9.44.30.11:5060>
                                              Server: Cisco-SIPGateway/IOS-15.2.2.5.T
                                              Content-Length: 0
                                              
                                              
                                              *Jun  7 17:26:30.753: //106/45C2DA468166/SIP/Msg/ccsipDisplayMsg:
                                              Sent: 
                                              SIP/2.0 180 Ringing
                                              Via: SIP/2.0/UDP [2001:DB8:C18:2:223:33FF:FEB1:B440]:5060;branch=z9hG4bK14B25D
                                              From: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;tag=5569ECC8-C79
                                              To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=22C9880-150D
                                              Date: Thu, 07 Jun 2012 17:26:30 GMT
                                              Call-ID: F44F5437-AFFD11E1-816CD9DB-F669887E@2001:DB8:C18:2:223:33FF:FEB1:B440
                                              Timestamp: 1339090505
                                              CSeq: 101 INVITE
                                              Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                              Allow-Events: telephone-event
                                              Remote-Party-ID: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;party=called;screen=no;privacy=off
                                              Contact: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060>
                                              Server: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                              Content-Length: 0
                                              
                                              
                                              *Jun  7 17:26:30.765: //107/45C2DA468166/SIP/Msg/ccsipDisplayMsg:
                                              Received: 
                                              SIP/2.0 200 OK
                                              Via: SIP/2.0/UDP 9.44.30.14:5060;branch=z9hG4bK90BB
                                              From: <sip:1001@9.44.30.14>;tag=22C984C-970
                                              To: <sip:6000@9.44.30.11>;tag=959183D0-2073
                                              Date: Thu, 07 Jun 2012 18:49:04 GMT
                                              Call-ID: C145AF07-AFFC11E1-813EF4DD-5665AA1B@9.44.30.14
                                              Timestamp: 1339089990
                                              CSeq: 101 INVITE
                                              Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                              Allow-Events: telephone-event
                                              Remote-Party-ID: <sip:6000@9.44.30.11>;party=called;screen=no;privacy=off
                                              Contact: <sip:6000@9.44.30.11:5060>
                                              Supported: replaces
                                              Require: sdp-anat
                                              Server: Cisco-SIPGateway/IOS-15.2.2.5.T
                                              Supported: timer
                                              Content-Type: application/sdp
                                              Content-Disposition: session;handling=required
                                              Content-Length: 412
                                              
                                              v=0
                                              o=CiscoSystemsSIP-GW-UserAgent 2764 5975 IN IP4 9.44.30.11
                                              s=SIP Call
                                              c=IN IP4 9.44.30.11
                                              t=0 0
                                              a=group:ANAT 1
                                              m=audio 17278 RTP/AVP 18 19
                                              c=IN IP4 9.44.30.11
                                              a=mid:1
                                              a=rtpmap:18 G729/8000
                                              a=fmtp:18 annexb=no
                                              a=rtpmap:19 CN/8000
                                              a=ptime:20
                                              m=audio 0 RTP/AVP 18 19
                                              c=IN IP6 2001:DB8:C18:2:217:59FF:FEDE:8898
                                              a=mid:2
                                              a=rtpmap:18 G729/8000
                                              a=fmtp:18 annexb=no
                                              a=rtpmap:19 CN/8000
                                              a=ptime:20
                                              
                                              
                                              *Jun  7 17:26:30.777: //107/45C2DA468166/SIP/Msg/ccsipDisplayMsg:
                                              Sent: 
                                              ACK sip:6000@9.44.30.11:5060 SIP/2.0
                                              Via: SIP/2.0/UDP 9.44.30.14:5060;branch=z9hG4bK91207D
                                              From: <sip:1001@9.44.30.14>;tag=22C984C-970
                                              To: <sip:6000@9.44.30.11>;tag=959183D0-2073
                                              Date: Thu, 07 Jun 2012 17:26:30 GMT
                                              Call-ID: C145AF07-AFFC11E1-813EF4DD-5665AA1B@9.44.30.14
                                              Max-Forwards: 70
                                              CSeq: 101 ACK
                                              Allow-Events: telephone-event
                                              Content-Length: 0
                                              
                                              
                                              *Jun  7 17:26:30.785: //106/45C2DA468166/SIP/Msg/ccsipDisplayMsg:
                                              Sent: 
                                              SIP/2.0 200 OK
                                              Via: SIP/2.0/UDP [2001:DB8:C18:2:223:33FF:FEB1:B440]:5060;branch=z9hG4bK14B25D
                                              From: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;tag=5569ECC8-C79
                                              To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=22C9880-150D
                                              Date: Thu, 07 Jun 2012 17:26:30 GMT
                                              Call-ID: F44F5437-AFFD11E1-816CD9DB-F669887E@2001:DB8:C18:2:223:33FF:FEB1:B440
                                              Timestamp: 1339090505
                                              CSeq: 101 INVITE
                                              Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                              Allow-Events: telephone-event
                                              Remote-Party-ID: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;party=called;screen=no;privacy=off
                                              Contact: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060>
                                              Supported: replaces
                                              Require: sdp-anat
                                              Server: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                              Supported: timer
                                              Content-Type: application/sdp
                                              Content-Disposition: session;handling=required
                                              Content-Length: 421
                                              
                                              v=0
                                              o=CiscoSystemsSIP-GW-UserAgent 9047 741 IN IP6 2001:DB8:C18:2:223:4FF:FEAC:4540
                                              s=SIP Call
                                              c=IN IP4 9.44.30.11
                                              t=0 0
                                              a=group:ANAT 1
                                              m=audio 17278 RTP/AVP 18 19
                                              c=IN IP4 9.44.30.11
                                              a=mid:1
                                              a=rtpmap:18 G729/8000
                                              a=fmtp:18 annexb=no
                                              a=rtpmap:19 CN/8000
                                              a=ptime:20
                                              m=audio 0 RTP/AVP 18 19
                                              c=IN IP6 2001:DB8:C18:2:217:59FF:FEDE:8898
                                              a=mid:2
                                              a=rtpmap:18 G729/8000
                                              a=fmtp:18 annexb=no
                                              a=rtpmap:19 CN/8000
                                              
                                              
                                              *Jun  7 17:26:30.793: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
                                              Received: 
                                              ACK sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060 SIP/2.0
                                              Via: SIP/2.0/UDP [2001:DB8:C18:2:223:33FF:FEB1:B440]:5060;branch=z9hG4bK14C15A2
                                              From: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;tag=5569ECC8-C79
                                              To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=22C9880-150D
                                              Date: Thu, 07 Jun 2012 17:35:05 GMT
                                              Call-ID: F44F5437-AFFD11E1-816CD9DB-F669887E@2001:DB8:C18:2:223:33FF:FEB1:B440
                                              Max-Forwards: 70
                                              CSeq: 101 ACK
                                              Allow-Events: telephone-event
                                              Content-Length: 0
                                              
                                              Step 2   show voip rtp connections


                                              Example:
                                              Device# show voip rtp connections
                                              
                                              VoIP RTP Port Usage Information:
                                              Max Ports Available: 8091, Ports Reserved: 101, Ports in Use: 0
                                              Port range not configured, Min: 16384, Max: 32767
                                              
                                                                                      Ports       Ports       Ports     
                                              Media-Address Range                     Available   Reserved    In-use    
                                              
                                              Default Address-Range                   8091        101         0         
                                              
                                              No active connections found
                                              

                                              Verifying VMWI SIP

                                              SUMMARY STEPS

                                                1.    show sip-ua mwi

                                                2.    debug vpm signal

                                                3.    debug ccsip messages


                                              DETAILED STEPS
                                                Step 1   show sip-ua mwi


                                                Example:
                                                Device# show sip-ua mwi
                                                MWI type: 2 
                                                MWI server: 2001:10:12:1::2006  //IPv6 MWI Server Address//
                                                MWI expires: 3600  
                                                MWI port: 5060
                                                MWI dial peer tag: 0  //Shows the MWI-Server binding dial-peer tag. Tag “0” is default.//
                                                MWI solicited  //MWI type is solicited by default. Subscription of voice-port is required in this case only.//
                                                MWI ipaddr cnt 1:
                                                MWI ipaddr idx 0:
                                                MWI server: 2001:10:12:1::2006, port 5060, transport 1  //IPv6 MWI Server Address//
                                                MWI server dns lookup retry cnt: 0
                                                Step 2   debug vpm signal


                                                Example:
                                                Device# debug vpm signal
                                                
                                                Process vmwi. vmwi state: OFF
                                                The phone is not on hook (1). Delay the vmwi processing.  //Phone is offhook//
                                                Process dc-voltage vmwi. State: OFF  //VMWI state is off//
                                                *Mar  2 02:33:34.841: [2/0] c2400_dc_volt_mwi: on=0
                                                The phone is not onhook (1). Delay the vmwi processing. Process vmwi. vmwi state: ON  //VMWI state is on//
                                                Voice port 0/2/1 subscribed MWI  //Subscription of port for MWI (Solicited)//
                                                
                                                Step 3   debug ccsip messages


                                                Example:
                                                Device# debug ccsip messages
                                                Note   

                                                The debug ccsip messages command shows the SIP Messages, such as Subscribe and Notify.


                                                Verifying SDP Passthrough Configuration

                                                SUMMARY STEPS

                                                  1.    debug ccsip all

                                                  2.    show voip rtp connection


                                                DETAILED STEPS
                                                  Step 1   debug ccsip all


                                                  Example:
                                                  Device# show logging
                                                  
                                                  Received: 
                                                  INVITE sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060 SIP/2.0
                                                  Via: SIP/2.0/UDP [2001:DB8:C18:2:223:33FF:FEB1:B440]:5060;branch=z9hG4bK20277F
                                                  Remote-Party-ID: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;party=calling;screen=no;privacy=off
                                                  From: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;tag=59283684-0
                                                  To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>
                                                  Date: Fri, 08 Jun 2012 11:01:48 GMT
                                                  Call-ID: 2D6EEC84-B09011E1-8235D9DB-F669887E@2001:DB8:C18:2:223:33FF:FEB1:B440
                                                  Supported: 100rel,timer,resource-priority,replaces
                                                  Require: sdp-anat
                                                  Min-SE:  1800
                                                  Cisco-Guid: 2131649325-2962952673-2175336473-0797538600
                                                  User-Agent: Cisco-SIPGateway/IOS-12.x
                                                  Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                                  CSeq: 101 INVITE
                                                  Max-Forwards: 70
                                                  Timestamp: 1339153308
                                                  Contact: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]:5060>
                                                  Expires: 180
                                                  Allow-Events: telephone-event
                                                  Content-Type: application/sdp
                                                  Content-Disposition: session;handling=required
                                                  Content-Length: 488
                                                  
                                                  v=0
                                                  o=CiscoSystemsSIP-GW-UserAgent 7132 4992 IN IP6 2001:DB8:C18:2:223:33FF:FEB1:B440
                                                  s=SIP Call
                                                  c=IN IP6 2001:DB8:C18:2:223:33FF:FEB1:B440
                                                  t=0 0
                                                  a=group:ANAT 1 2
                                                  m=audio 16406 RTP/AVP 18 0 19
                                                  c=IN IP6 2001:DB8:C18:2:223:33FF:FEB1:B440
                                                  a=mid:1
                                                  a=rtpmap:18 G729/8000
                                                  a=fmtp:18 annexb=no
                                                  a=rtpmap:0 PCMU/8000
                                                  a=rtpmap:19 CN/8000
                                                  m=audio 18024 RTP/AVP 18 0 19
                                                  c=IN IP4 9.44.30.13
                                                  a=mid:2
                                                  a=rtpmap:18 G729/8000
                                                  a=fmtp:18 annexb=no
                                                  a=rtpmap:0 PCMU/8000
                                                  a=rtpmap:19 CN/8000
                                                  
                                                  Sent: 
                                                  SIP/2.0 100 Trying
                                                  Via: SIP/2.0/UDP [2001:DB8:C18:2:223:33FF:FEB1:B440]:5060;branch=z9hG4bK20277F
                                                  From: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;tag=59283684-0
                                                  To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>
                                                  Date: Fri, 08 Jun 2012 10:53:14 GMT
                                                  Call-ID: 2D6EEC84-B09011E1-8235D9DB-F669887E@2001:DB8:C18:2:223:33FF:FEB1:B440
                                                  Timestamp: 1339153308
                                                  CSeq: 101 INVITE
                                                  Allow-Events: telephone-event
                                                  Server: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                                  Content-Length: 0
                                                  
                                                  Sent: 
                                                  INVITE sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]:5060 SIP/2.0
                                                  Via: SIP/2.0/UDP [2001:DB8:C18:2:223:4FF:FEAC:4540]:5060;branch=z9hG4bK15D1013
                                                  Remote-Party-ID: <sip:1001@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;party=calling;screen=no;privacy=off
                                                  From: <sip:1001@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=5EAE624-253A
                                                  To: <sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]>
                                                  Date: Fri, 08 Jun 2012 10:53:14 GMT
                                                  Call-ID: FB05CC74-B08E11E1-82C1F4DD-5665AA1B@2001:DB8:C18:2:223:4FF:FEAC:4540
                                                  Supported: timer,resource-priority,replaces,sdp-anat
                                                  Min-SE:  1800
                                                  Cisco-Guid: 2131649325-2962952673-2175336473-0797538600
                                                  User-Agent: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                                  Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                                  CSeq: 101 INVITE
                                                  Timestamp: 1339152794
                                                  Contact: <sip:1001@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060>
                                                  Expires: 180
                                                  Allow-Events: telephone-event
                                                  Max-Forwards: 69
                                                  Content-Type: application/sdp
                                                  Content-Disposition: session;handling=required
                                                  Content-Length: 443
                                                  
                                                  v=0
                                                  o=CiscoSystemsSIP-GW-UserAgent 7132 4992 IN IP6 2001:DB8:C18:2:223:33FF:FEB1:B440
                                                  s=SIP Call
                                                  t=0 0
                                                  a=group:ANAT 1 2
                                                  m=audio 16712 RTP/AVP 18 0 19
                                                  c=IN IP6 2001:DB8:C18:2:223:4FF:FEAC:4540
                                                  a=mid:1
                                                  a=rtpmap:18 G729/8000
                                                  a=fmtp:18 annexb=no
                                                  a=rtpmap:0 PCMU/8000
                                                  a=rtpmap:19 CN/8000
                                                  m=audio 16714 RTP/AVP 18 0 19
                                                  c=IN IP4 9.44.30.14
                                                  a=mid:2
                                                  a=rtpmap:18 G729/8000
                                                  a=fmtp:18 annexb=no
                                                  a=rtpmap:0 PCMU/8000
                                                  a=rtpmap:19 CN/8000
                                                  
                                                  *Jun  8 10:53:14.137: //243/7F0E632D81A9/SIP/Msg/ccsipDisplayMsg:
                                                  Received: 
                                                  SIP/2.0 100 Trying
                                                  Via: SIP/2.0/UDP [2001:DB8:C18:2:223:4FF:FEAC:4540]:5060;branch=z9hG4bK15D1013
                                                  From: <sip:1001@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=5EAE624-253A
                                                  To: <sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]>
                                                  Date: Fri, 08 Jun 2012 12:15:49 GMT
                                                  Call-ID: FB05CC74-B08E11E1-82C1F4DD-5665AA1B@2001:DB8:C18:2:223:4FF:FEAC:4540
                                                  Timestamp: 1339152794
                                                  CSeq: 101 INVITE
                                                  Allow-Events: telephone-event
                                                  Server: Cisco-SIPGateway/IOS-15.2.2.5.T
                                                  Content-Length: 0
                                                  
                                                  Received: 
                                                  SIP/2.0 180 Ringing
                                                  Via: SIP/2.0/UDP [2001:DB8:C18:2:223:4FF:FEAC:4540]:5060;branch=z9hG4bK15D1013
                                                  From: <sip:1001@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=5EAE624-253A
                                                  To: <sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]>;tag=994FD4C0-90B
                                                  Date: Fri, 08 Jun 2012 12:15:49 GMT
                                                  Call-ID: FB05CC74-B08E11E1-82C1F4DD-5665AA1B@2001:DB8:C18:2:223:4FF:FEAC:4540
                                                  Timestamp: 1339152794
                                                  CSeq: 101 INVITE
                                                  Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                                  Allow-Events: telephone-event
                                                  Remote-Party-ID: <sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]>;party=called;screen=no;privacy=off
                                                  Contact: <sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]:5060>
                                                  Server: Cisco-SIPGateway/IOS-15.2.2.5.T
                                                  Content-Length: 0
                                                  
                                                  Sent: 
                                                  SIP/2.0 180 Ringing
                                                  Via: SIP/2.0/UDP [2001:DB8:C18:2:223:33FF:FEB1:B440]:5060;branch=z9hG4bK20277F
                                                  From: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;tag=59283684-0
                                                  To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=5EAE658-2545
                                                  Date: Fri, 08 Jun 2012 10:53:14 GMT
                                                  Call-ID: 2D6EEC84-B09011E1-8235D9DB-F669887E@2001:DB8:C18:2:223:33FF:FEB1:B440
                                                  Timestamp: 1339153308
                                                  CSeq: 101 INVITE
                                                  Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                                  Allow-Events: telephone-event
                                                  Remote-Party-ID: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;party=called;screen=no;privacy=off
                                                  Contact: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060>
                                                  Server: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                                  Content-Length: 0
                                                  
                                                  Received: 
                                                  SIP/2.0 200 OK
                                                  Via: SIP/2.0/UDP [2001:DB8:C18:2:223:4FF:FEAC:4540]:5060;branch=z9hG4bK15D1013
                                                  From: <sip:1001@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=5EAE624-253A
                                                  To: <sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]>;tag=994FD4C0-90B
                                                  Date: Fri, 08 Jun 2012 12:15:49 GMT
                                                  Call-ID: FB05CC74-B08E11E1-82C1F4DD-5665AA1B@2001:DB8:C18:2:223:4FF:FEAC:4540
                                                  Timestamp: 1339152794
                                                  CSeq: 101 INVITE
                                                  Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                                  Allow-Events: telephone-event
                                                  Remote-Party-ID: <sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]>;party=called;screen=no;privacy=off
                                                  Contact: <sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]:5060>
                                                  Supported: replaces
                                                  Require: sdp-anat
                                                  Server: Cisco-SIPGateway/IOS-15.2.2.5.T
                                                  Supported: timer
                                                  Content-Type: application/sdp
                                                  Content-Disposition: session;handling=required
                                                  Content-Length: 434
                                                  
                                                  v=0
                                                  o=CiscoSystemsSIP-GW-UserAgent 5870 3683 IN IP6 2001:DB8:C18:2:217:59FF:FEDE:8898
                                                  s=SIP Call
                                                  c=IN IP6 2001:DB8:C18:2:217:59FF:FEDE:8898
                                                  t=0 0
                                                  a=group:ANAT 1
                                                  m=audio 17424 RTP/AVP 18 19
                                                  c=IN IP6 2001:DB8:C18:2:217:59FF:FEDE:8898
                                                  a=mid:1
                                                  a=rtpmap:18 G729/8000
                                                  a=fmtp:18 annexb=no
                                                  a=rtpmap:19 CN/8000
                                                  m=audio 0 RTP/AVP 18 19
                                                  c=IN IP4 9.44.30.11
                                                  a=mid:2
                                                  a=rtpmap:18 G729/8000
                                                  a=fmtp:18 annexb=no
                                                  a=rtpmap:19 CN/8000
                                                  
                                                  Sent: 
                                                  ACK sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]:5060 SIP/2.0
                                                  Via: SIP/2.0/UDP [2001:DB8:C18:2:223:4FF:FEAC:4540]:5060;branch=z9hG4bK15E99E
                                                  From: <sip:1001@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=5EAE624-253A
                                                  To: <sip:6000@[2001:DB8:C18:2:217:59FF:FEDE:8898]>;tag=994FD4C0-90B
                                                  Date: Fri, 08 Jun 2012 10:53:14 GMT
                                                  Call-ID: FB05CC74-B08E11E1-82C1F4DD-5665AA1B@2001:DB8:C18:2:223:4FF:FEAC:4540
                                                  Max-Forwards: 70
                                                  CSeq: 101 ACK
                                                  Allow-Events: telephone-event
                                                  Content-Length: 0
                                                  
                                                  Sent: 
                                                  SIP/2.0 200 OK
                                                  Via: SIP/2.0/UDP [2001:DB8:C18:2:223:33FF:FEB1:B440]:5060;branch=z9hG4bK20277F
                                                  From: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;tag=59283684-0
                                                  To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=5EAE658-2545
                                                  Date: Fri, 08 Jun 2012 10:53:14 GMT
                                                  Call-ID: 2D6EEC84-B09011E1-8235D9DB-F669887E@2001:DB8:C18:2:223:33FF:FEB1:B440
                                                  Timestamp: 1339153308
                                                  CSeq: 101 INVITE
                                                  Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
                                                  Allow-Events: telephone-event
                                                  Remote-Party-ID: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;party=called;screen=no;privacy=off
                                                  Contact: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060>
                                                  Supported: replaces
                                                  Supported: sdp-anat
                                                  Server: Cisco-SIPGateway/IOS-15.2.20120528.102328.
                                                  Supported: timer
                                                  Content-Type: application/sdp
                                                  Content-Disposition: session;handling=required
                                                  Content-Length: 389
                                                  
                                                  v=0
                                                  o=CiscoSystemsSIP-GW-UserAgent 5870 3683 IN IP6 2001:DB8:C18:2:217:59FF:FEDE:8898
                                                  s=SIP Call
                                                  t=0 0
                                                  a=group:ANAT 1
                                                  m=audio 16710 RTP/AVP 18 19
                                                  c=IN IP6 2001:DB8:C18:2:223:4FF:FEAC:4540
                                                  a=mid:1
                                                  a=rtpmap:18 G729/8000
                                                  a=fmtp:18 annexb=no
                                                  a=rtpmap:19 CN/8000
                                                  m=audio 0 RTP/AVP 18 19
                                                  c=IN IP4 9.44.30.14
                                                  a=mid:2
                                                  a=rtpmap:18 G729/8000
                                                  a=fmtp:18 annexb=no
                                                  a=rtpmap:19 CN/8000
                                                  
                                                  Received: 
                                                  ACK sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]:5060 SIP/2.0
                                                  Via: SIP/2.0/UDP [2001:DB8:C18:2:223:33FF:FEB1:B440]:5060;branch=z9hG4bK203700
                                                  From: <sip:1001@[2001:DB8:C18:2:223:33FF:FEB1:B440]>;tag=59283684-0
                                                  To: <sip:6000@[2001:DB8:C18:2:223:4FF:FEAC:4540]>;tag=5EAE658-2545
                                                  Date: Fri, 08 Jun 2012 11:01:48 GMT
                                                  Call-ID: 2D6EEC84-B09011E1-8235D9DB-F669887E@2001:DB8:C18:2:223:33FF:FEB1:B440
                                                  Max-Forwards: 70
                                                  CSeq: 101 ACK
                                                  Allow-Events: telephone-event
                                                  Content-Length: 0
                                                  
                                                  Step 2   show voip rtp connection


                                                  Example:
                                                  Device# show voip rtp connection
                                                  
                                                  VoIP RTP Port Usage Information:
                                                  Max Ports Available: 8091, Ports Reserved: 101, Ports in Use: 2
                                                  Port range not configured, Min: 16384, Max: 32767
                                                  
                                                                                          Ports       Ports       Ports     
                                                  Media-Address Range                     Available   Reserved    In-use    
                                                  
                                                  Default Address-Range                   8091        101         2         
                                                  
                                                  VoIP RTP active connections :
                                                  No. CallId     dstCallId  LocalRTP RmtRTP LocalIP                                RemoteIP                               
                                                  1     242        243        16710    16406  2001:DB8:C18:2:223:4FF:FEAC:4540       2001:DB8:C18:2:223:33FF:FEB1:B440      
                                                  2     243        242        16712    17424  2001:DB8:C18:2:223:4FF:FEAC:4540       2001:DB8:C18:2:217:59FF:FEDE:8898      
                                                  Found 2 active RTP connections
                                                  

                                                  Feature Information for VoIP for IPv6

                                                  The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

                                                  Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

                                                  Table 1 Feature Information for VoIP for IPv6

                                                  Feature Name

                                                  Releases

                                                  Feature Information

                                                  Cisco UBE support for IPv6

                                                  12.4(22)T

                                                  Cisco Unified Border Element (Cisco UBE) support for SIP IPv4-IPv6 dual stack and IPv4 and IPv6 capability provides the following functionality:

                                                  • Translation of SIP IPv4 to IPv6 addresses
                                                  • Administration and enforcement of policies for the IPv4/IPv6 mode of operation of each component.
                                                  • Supports the following scenarios: H.323 IPv4 to SIP IPv6; SIP IPv4 to SIP IPv6, SIP IPv6 to SIP IPv6
                                                  • DTMF: Interworking capability on Cisco UBE (H.245 Signal, RFC 2833, SIP Notify, Key Press Markup Language,H.323 to SIP, RFC 2833 to G.711 Inband)
                                                  • IPv6 topology hiding and demarcation
                                                  • SIP Options-ping

                                                  The VoIP for IPv6 feature describes the Session Border Controller (SBC) functionality of connecting a SIP IPv4 or H.323 IPv4 network to a SIP IPv6 network that is implemented on a Cisco UBE to facilitate migration from VoIPv4 to VoIPv6.

                                                  Cisco UBE support for IPv6

                                                  15.3(2)T

                                                  The following features are supported on Cisco UBE for 15.3(2)T:

                                                  • Assisted RTCP (RTCP Keepalive)
                                                  • Audio Transcoding using Local Transcoding Interface (LTI)
                                                  • Address Hiding
                                                  • Call Transfer (re-INVITE, REFER)
                                                  • Call Forward (302 based)
                                                  • IP Toll Fraud
                                                  • Hold/Resume
                                                  • Media Flow-Through (FT)
                                                  • Media Flow-Around (FA)
                                                  • RE-INVITE Consumption
                                                  • RTP Port Range
                                                  • SDP Pass-Through
                                                  • UDP Checksum
                                                  • Media Anti-Trombone
                                                  • Header Passing
                                                  • Refer-To Passing
                                                  • Error Pass-through
                                                  • SIP UPDATE Interworking
                                                  • SIP Session timer (RFC 4028)
                                                  • SIP OPTIONS Ping
                                                  • Configurable Error Response Code in OPTIONS Ping
                                                  • Limiting the Rate of Incoming SIP Calls per Dial-Peer (aka Call Spike)
                                                  • SIP Profiles
                                                  • SIP Media Inactivity Detection
                                                  • Dynamic Payload Type Interworking (DTMF and Codec Packets)
                                                  • Voice Class Codec (VCC) with or without Transcoding
                                                  • PPI/PAI/Privacy and RPID Passing

                                                  DSCP-Based QoS Support

                                                  12.4(22)T

                                                  IPv6 supports this feature.

                                                  IPv6 Dual Stack

                                                  12.4(22)T

                                                  Adds IPv6 capability to existing VoIP features on the Cisco UBE. Additionally, the SBC functionality of connecting SIP IPv4 or H.323 IPv4 network to SIP IPv6 network is implemented on a Cisco UBE to facilitate migration from VoIPv4 to VoIPv6.

                                                  The following commands were introduced or modified: None

                                                  RTP/RTCP over IPv6

                                                  12.4(22)T

                                                  RTP stack supports the ability to create IPv6 connections using IPv6 unicast and multicast addresses as well as IPV4 connections.

                                                  TDM-SIP GW for IPv6

                                                  12.4(24)T

                                                  15.3(2)T

                                                  IPv6 supports this feature.

                                                  • Session Initiation Protocol Features Supported on IPv6
                                                  • Cisco UBE features Supported on IPv6
                                                  • SIP Gateway Generic Features
                                                  Apart from the SIP Gateway features already supported on IPv4 and IPv6 for 12.4(24)T release, the following features are also supported on IPv6:
                                                  • SIP VMWI for FXS phones
                                                  • History-Info
                                                  • Handling 181/183 Responses with/without SDP
                                                  • SIP Session Timer (4028)
                                                  • SIP Media Inactivity Detection
                                                  • PPI/PAI & Privacy (RFC3323/RFC3325) Headers