Cisco Unified Border Element (Enterprise) SIP Support Configuration Guide, Cisco IOS XE Release 3S
RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls
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RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls

The RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls feature globally enables RFC 4040-based clear-channel codec negotiation [CLEARMODE/8000] for SIP calls on a Cisco IOS voice gateway or Cisco UBE. RFC 4040-based clear-channel codec negotiation allows Cisco IOS voice gateways and Cisco UBEs to successfully interoperate with third-party SIP gateways that do not support legacy Cisco IOS clear-channel codec encapsulation [X-CCD/8000].

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 RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls

Cisco Unified Border Element

  • Cisco IOS Release 15.0(1)XA or a later release must be installed and running on your Cisco Unified Border Element.

Cisco Unified Border Element (Enterprise)

  • Cisco IOS XE Release 3.1S or a later release must be installed and running on your Cisco ASR 1000 Series Router.

Restrictions for RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls

  • This feature is supported on Cisco IOS SIP time division multiplexing (TDM) gateways and Cisco Unified Border Elements (Cisco UBEs).

Information about RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls

When the encap clear-channel standard command is enabled on a Cisco IOS voice gateway or Cisco UBE, calls using the Cisco IOS clear channel codec are translated into calls that use CLEARMODE/8000 so that the calls do not get rejected when they reach third-party SIP gateways.

To enable RFC 4040-based clear-channel codec negotiation for SIP calls on an individual dial peer, overriding the global configuration for the Cisco IOS voice gateway or Cisco UBE, use the voice-class sip encap clear-channel standard command in dial peer voice configuration mode. To globally disable RFC 4040-based clear-channel codec negotiation on a Cisco IOS voice gateway or Cisco UBE, use the no encap clear-channel standard command in voice service SIP configuration mode.

How to Configure RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls

This feature can be enabled globally for all dial peers or on an individual dial peer (which overrides the global configuration, if one is in effect). Depending on your requirements, complete one of the following tasks:

Configuring RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls Globally for All Dial Peers

To configure RFC 4040-based clear-channel code negotiation globally for all dial peers on a Cisco IOS voice gateway or Cisco UBE, complete this task:

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    voice service voip

    4.    sip

    5.    encap clear-channel standard


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Router> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.
     
    Step 2 configure terminal


    Example:
    Router# configure terminal
     

    Enters global configuration mode.

     
    Step 3 voice service voip


    Example:
    Router(config)# voice service voip
     

    Enters voice service configuration mode.

     
    Step 4 sip


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

    Enters voice service SIP configuration mode.

     
    Step 5 encap clear-channel standard


    Example:
    Router(conf-serv-sip)# encap clear-channel standard
     

    Globally enables RFC 4040-based clear-channel codec negotiation [CLEARMODE/8000] for SIP calls on a Cisco IOS voice gateway or Cisco UBE.

     

    Configuring RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls for a Single Dial Peer

    To configure RFC 4040-based clear-channel code negotiation for one dial peer on a Cisco IOS voice gateway or Cisco UBE, complete this task:

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    dial-peer voice 1 voip

      4.    voice-class sip encap clear-channel standard


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Router> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.
       
      Step 2 configure terminal


      Example:
      Router# configure terminal
       

      Enters global configuration mode.

       
      Step 3 dial-peer voice 1 voip


      Example:
      Router(config)# dial-peer voice 1 voip
       

      Enters dial peer voice configuration mode.

       
      Step 4 voice-class sip encap clear-channel standard


      Example:
      Router(config-dial-peer)# voice-class sip encap clear-channel standard
       

      Enables RFC 4040-based clear-channel codec negotiation for SIP calls on an individual dial peer, overriding the global setting on a Cisco IOS voice gateway or Cisco UBE.

      Note   

      You can also configure a specific dial peer to use global configuration settings for clear-channel codec negotiation.To enable this capability, substitute the voice-class sip encap clear-channel system command in this step of the configuration.

       

      Feature Information for RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls

      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.

      Feature History Table entry for the Cisco Unified Border Element.

      Table 1 Feature Information for RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls

      Feature Name

      Releases

      Feature Information

      RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls

      15.0(1)XA 15.1(1)T

      This feature adds support for RFC 4040-based clear channel codec Negotiation for SIP calls.

      The following commands were modified: encap clear-channel standardand voice-class sip encap clear-channel

      Feature History Table entry for the Cisco Unified Border Element (Enterprise)

      Table 2  Feature Information for RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls

      Feature Name

      Releases

      Feature Information

      RFC 4040-Based Clear Channel Codec Negotiation for SIP Calls

      Cisco IOS XE Release 3.1S

      This feature adds support for RFC 4040-based clear channel codec Negotiation for SIP calls.

      The following commands were modified: encap clear-channel standardand voice-class sip encap clear-channel