Cisco Unified Communications Manager and Interoperability Configuration Guide, Cisco IOS Release 15M&T
Configuring MGCP PRI Backhaul and T1 CAS Support
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Configuring MGCP PRI Backhaul and T1 CAS Support

Contents

Configuring MGCP PRI Backhaul and T1 CAS Support

This chapter describes the procedures for enabling MGCP PRI backhaul support for Cisco Unified Communications Manager on the Cisco IOS gateway and describes related features.

Feature History for QSIG Supplementary Features for Voice Gateway Routers

Release

Modification

12.3(8)XY

This feature was introduced.

12.3(11)T

This feature was integrated into Cisco IOS Release 12.3(11)T.

Feature History for MGCP Gateway Support for Cisco Unified Communications Manager Network Specific Facilities

Release

Modification

12.2(15)ZJ

This feature was introduced.

12.3(4)T

This feature was integrated into Cisco IOS Release 12.3(4)T.

Feature History for MGCP PRI Backhaul and T1 CAS Support for Cisco Unified Communications Manager

Release

Modification

12.2(2)XN

This feature was introduced for Cisco Unified Communications Manager 3.0 (formerly known as Cisco CallManager 3.0).

12.2(11)T

Support was added for Cisco Unified Communications Manager 3.2 (formerly known as Cisco CallManager 3.2).

Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http:/​/​www.cisco.com/​go/​fn . You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.

For more information about this and related Cisco IOS voice features, see the following:

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 MGCP PRI Backhaul and T1 CAS Support

  • Cisco IOS Release 12.2(11)T.
  • QSIG signaling is required to support supplementary services over the T1 and E1 time-division multiplexing (TDM) trunks that support the PRI backhaul mechanism.

Restrictions for MGCP PRI Backhaul and T1 CAS Support

  • Voice interfaces on the NM-HDA and the AIM-VOICE-30 are not supported.
  • Integrated access, in which the channels on a T1 or E1 interface are divided between a group used for voice and another group used for WAN access, is not supported when voice is controlled by Cisco Unified Communications Manager through MGCP.
  • T1 and E1 protocols, such as QSIG, E1 R2, T1 FGD, and PRI NFAS, are not supported with MGCP only with H.323.
  • E1 CAS is not supported.
  • Do not add the application mgcpapp command to dial peers that support PRI backhaul.

Information About MGCP PRI Backhaul and T1 CAS Support

MGCP PRI Backhaul Overview

MGCP PRI backhaul is a method for transporting complete IP telephony signaling information from an ISDN PRI interface in an MGCP gateway to Cisco Unified Communications Manager using a highly reliable TCP connection. The gateway uses a single TCP connection to backhaul all ISDN D channels to Cisco Unified Communications Manager. The "SAP/Channel ID" parameter in the header of each message identifies individual D channels. In addition to carrying the backhaul traffic, the TCP keepalive mechanism also determines MGCP voice gateway connectivity to an available call agent.

MGCP PRI backhaul terminates all ISDN PRI Layer 2 (Q.921) signaling functions on the MGCP gateway while, at the same time, packaging all the ISDN PRI Layer 3 (Q.931) signaling information into packets for transmission to Cisco Unified Communications Manager through an IP tunnel over a TCP connection. This ensures the integrity of the Q.931 signaling information that passes through the network for managing IP telephony devices. A rich set of user-side and network-side ISDN PRI calling functions is supported by MGCP PRI backhaul.

The MGCP gateway also establishes a TCP link to the backup (secondary) Cisco Unified Communications Manager server. In the event of a Cisco Unified Communications Manager switchover, the secondary Cisco Unified Communications Manager server performs the MGCP PRI backhaul functions. During the switchover, all active ISDN PRI calls are preserved, and the affected MGCP gateway is registered with the new Cisco Unified Communications Manager server through a Restart-in-Progress (RSIP) message. In this way, continued gateway operation is ensured.

T1 CAS is supported in nonbackhaul fashion. Cisco Unified Communications Manager supports the following CAS signaling types: E&M, wink-start, and E&M delay-dial. E1 CAS is not supported.

ISDN NSF in Route Patterns

The MGCP Gateway Support for Cisco Unified Communications Manager Network Specific Facilities (NSF) feature supports the use of the ISDN NSF information element in the route pattern. This feature is compatible with Cisco Communications Manager 3.3(2) (formerly known as Cisco CallManager 3.3(2)) and later.

The route pattern design in Cisco Unified Communications Manager enables facilities or services to be invoked on a call-by-call basis. The NSF information element, which is used in ISDN PRI setup messages for outgoing calls, includes the carrier identification code (CIC) and service parameters. The NSF configuration is done in Cisco Unified Communications Manager as part of the route pattern for MGCP-controlled PRI ports. The NSF information element is inserted in the Q.931 stream so that the attached PSTN switch can interpret the information elements and select the service and route the call to a network.

With NSF configured, NSF can be used on a call-by-call basis. Without NSF configuration, you must configure associated gateways as standalone H.323 gateways for which NSF services are configured locally within the router. No configuration is required on the MGCP gateway to use the NSF feature.

How to Configure MGCP PRI Backhaul Support

Configuring MGCP PRI Backhaul on the Cisco Voice Gateway

Perform this task to configure MGCP PRI backhaul on a Cisco Voice Gateway.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    controller {t1 | e1} slot/port

    4.    framing {esf | sf | crc4 | no-crc4 | mp-crc4} [australia]

    5.    clock source {internal | line}

    6.    linecode {ami | b8zs | hdb3}

    7.    isdn switch-type {primary-4ess | primary-5ess | primary-dms100 | primary-ni | primary-net5 | primary-ntt | primary-qsig | primary-ts014}

    8.    pri-group timeslots timeslot-range service mgcp

    9.    exit

    10.    interface serial slot / port : timeslot

    11.    isdn bind-L3 ccm-manager

    12.    exit


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Router> enable
     

    Enables privileged EXEC mode.

    • Enter your password when prompted.
     
    Step 2 configure terminal


    Example:
    Router# configure terminal
     

    Enters global configuration mode.

     
    Step 3 controller {t1 | e1} slot/port


    Example:
    Router(config)# controller t1 3/0
     

    Enters controller configuration mode.

     
    Step 4 framing {esf | sf | crc4 | no-crc4 | mp-crc4} [australia]


    Example:
    Router(config-controller)# framing esf
     

    Specifies the framing type on a E1 or T1 PRI line.

    • Default is sf (super frame) for T1 lines; CRC4 for E1 lines.
     
    Step 5 clock source {internal | line}


    Example:
    Router(config-controller)# clock source internal
     

    Configures the clock source used by the E1 or T1 controller.

    • Default is line.
     
    Step 6 linecode {ami | b8zs | hdb3}


    Example:
    Router(config-controller)# linecode b8zs
     

    Specifies the line encoding method for the link.

    • Default is ami (alternate mark inversion) for T1 lines; hdb3 (high-density bipolar 3) for E1 lines.
     
    Step 7 isdn switch-type {primary-4ess | primary-5ess | primary-dms100 | primary-ni | primary-net5 | primary-ntt | primary-qsig | primary-ts014}


    Example:
    Router(config-if)# isdn switch-type primary-5ess
     

    Specifies the ISDN switch type.

    Note   

    This command can be entered in either global configuration mode or interface configuration mode.

     
    Step 8 pri-group timeslots timeslot-range service mgcp


    Example:
    Router(config-controller)# pri-group timeslots 1-24 service mgcp
     

    Specifies MGCP as the control protocol used for backhaul.

    Note   

    The controller time slots cannot be shared between backhaul and other Layer 3 protocols.

     
    Step 9 exit


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

    Exits controller configuration mode and returns to global configuration mode.

     
    Step 10 interface serial slot / port : timeslot


    Example:
    Router(config)# interface serial 3/0:0
     

    Enters serial interface configuration mode.

    • The syntax of this command is platform-dependent; type ? to determine.
     
    Step 11 isdn bind-L3 ccm-manager


    Example:
    Router(config-if)# isdn bind-L3 ccm-manager
     

    Enables ISDN to backhaul Q.931.

     
    Step 12 exit


    Example:
    Router(config-if)# exit
     

    Exits interface configuration mode and returns to global configuration mode.

     

    Verifying MGCP PRI Backhaul Configuration

    Perform this task to verify the configuration.

    SUMMARY STEPS

      1.    show isdn status

      2.    show ccm-manager

      3.    show ccm-manager backhaul


    DETAILED STEPS
      Step 1   show isdn status

      Use the show isdn status command to verify connectivity.

      In the following sample output, the Layer 2 protocol is Q.921, and the Layer 3 protocol is CCM-MANAGER. This output verifies that the Layer 2 and Layer 3 protocols are configured to backhaul ISDN. If you are connected to a live line, you should see Layer 1 status as active and Layer 2 as MULTIPLE_FRAME_ESTABLISHED.



      Example:
      Router# show isdn status
      *00:03:34.423 UTC Sat Jan 1 2000
      Global ISDN Switchtype = primary-net5
      ISDN Serial1:23 interface
      !
      ******* Network side configuration ******* 
      !
       dsl 0, interface ISDN Switchtype = primary-net5
      !
      **** Master side configuration ****
      !
       L2 Protocol = Q.921 L3 Protocol(s) = CCM-MANAGER
       Layer 1 Status: ACTIVE Layer 2 Status:
       TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
       Layer 3 Status:
       NLCB:callid=0x0, callref=0x0, state=31, ces=0 event=0x0
       NLCB:callid=0x0, callref=0x0, state=0, ces=1 event=0x0
       0 Active Layer 3 Call(s)
       Activated dsl 0 CCBs = 0
       Number of active calls = 0
       Number of available B-channels = 23
       Total Allocated ISDN CCBs = 0
      
      Step 2   show ccm-manager

      Use the show ccm-manager command to view the registration status with Cisco Unified Communications Manager, for example:



      Example:
      Router# show ccm-manager
      MGCP Domain Name: AV-2620-4
      Priority        Status                       Host
      ============================================================
      Primary         Registered                   10.16.240.124
      First Backup    Backup Ready                 10.16.240.128
      Second Backup   None 
      Current active Call Manager:    10.16.240.124 
      Backhaul/Redundant link port:   2428 
      Failover Interval:              30 seconds 
      Keepalive Interval:             15 seconds 
      Last keepalive sent:            00:45:31 (elapsed time: 00:00:04) 
      Last MGCP traffic time:         00:45:31 (elapsed time: 00:00:04) 
      Last failover time:             None 
      Switchback mode:                Graceful 
      MGCP Fallback mode:             Not Selected 
      Last MGCP Fallback start time:  00:00:00 
      Last MGCP Fallback end time:    00:00:00 
      PRI Backhaul Link info:       
        Link Protocol:       TCP    
        Remote Port Number:  2428   
        Remote IP Address:   10.16.240.124  
        Current Link State:  OPEN   
        Statistics:      
           Packets recvd:    32     
           Recv failures:    0      
           Packets xmitted:  32     
           Xmit failures:    0      
        PRI Ports being backhauled: 
           Slot 1, port 0 
      Configuration Auto-Download Information 
      ======================================= 
      Current version-id: {1645327B-F59A-4417-8E01-7312C61216AE}
      Last config-downloaded:00:00:49
      Current state: Waiting for commands
      Configuration Download statistics:
              Download Attempted             : 6
                Download Successful          : 6
                Download Failed              : 0
              Configuration Attempted        : 1
                Configuration Successful     : 1
                Configuration Failed(Parsing): 0
                Configuration Failed(config) : 0
      Last config download command: New Registration
      Configuration Error History:
      FAX mode: cisco
      
      Step 3   show ccm-manager backhaul

      Use the show ccm-manager backhaul command to verify the PRI backhaul link information, for example:



      Example:
      Router# show ccm-manager backhaul
      PRI Backhaul Link info:
       Link Protocol:          TCP
       Remote Port Number:     2428
       Remote IP Address:      10.20.71.38
       Current Link State:     OPEN
       Statistics:
        Packets recvd:         0
        Recv failures:         0
        Packets xmitted:       21
        Xmit failures:         0
      PRI Ports being backhauled:
       Slot 1, port 1
      Note   

      For a description of the fields displayed in these output examples, see the Cisco IOS Voice Command Reference, Release 12.3T.


      Configuring MGCP Gateway Support for Cisco Unified Communications Manager NSF

      There are no specific Cisco IOS configuration tasks necessary to support the Network Specific Facilities (NSF) feature other than enabling MGCP PRI backhaul as described in the Configuring MGCP PRI Backhaul on the Cisco Voice Gateway.

      Prerequisites for MGCP Gateway Support for Cisco Unified Communications Manager NSF

      • Cisco IOS Release 12.3(4)T or later
      • NM-HDV or NM-HDV2
      • Supported interface cards:
        • AIM-ATM-VOICE-30
        • AIM-VOICE-30
      • Supported switch types:
        • PRI 4ESS
        • PRI 5E8
        • PRI 5E9
        • DMS 100
        • DMS 250
        • PRI NI-2
      • Cisco Unified Communications Manager 3.3(2) (formerly known as Cisco CallManager 3.3(2)) or later with the following configured:
        • Network Service Protocol--Choose the PRI protocol that matches the protocol of the terminating gateway from the Network Service Protocol drop-down field.
        • Network Service--Choose the appropriate network service. The values vary depending on the network service protocol that you choose from the Network Service Protocol drop-down field.
        • Service Parameter Name--Displays the service parameter name that is associated with the chosen network service. If no service parameter exists for the network service, the field displays <Not Exist>.
        • Service Parameter Value--Enter the appropriate service parameter value. Valid entries include the digits 0 to 9. If a service parameter does not exist for the network service, Cisco Unified Communications Manager disables this field.
        • Route patterns--For more information, see the Cisco Unified CallManager Administration Guide, Release 4.0(1) .
      • Cisco Unified Communications Manager supports NSF only if the appropriate carrier identification code (CIC) is entered in the CIC field. CICs, which can be 3 or 4 digits or no digits, enable you to reach the services of interexchange carriers. For a complete list of CICs, go to http:/​/​www.nanpa.com . The following are examples of commonly used CICs:
        • 0222--WorldCom and MCI
        • 0288--ATT
        • 0333--Sprint

      Verifying MGCP Gateway Support for Cisco Unified Communications Manager NSF

      Perform this task to verify the configuration.

      SUMMARY STEPS

        1.    show ccm-manager

        2.    show mgcp endpoints

        3.    debug ccm-manager backhaul

        4.    debug isdn q931


      DETAILED STEPS
        Step 1   show ccm-manager

        Use the show ccm-manager command to verify the registration status of Cisco Unified Communications Manager, for example:



        Example:
        Router# show ccm-manager
        MGCP Domain Name: Router
        Priority Status Host
        ============================================================                          Primary Registered 10.16.240.124
        First Backup    None
        Second Backup   None
        Current active Call Manager: 10.16.240.124
        Backhaul/Redundant link port: 2428 
        Failover Interval: 30 seconds
        Keepalive Interval: 15 seconds
        Last keepalive sent: 00:45:31 (elapsed time: 00:00:04)
        Last MGCP traffic time: 00:45:31 (elapsed time: 00:00:04)
        Last failover time: None
        Switchback mode: Graceful
        MGCP Fallback mode: Not Selected
        Last MGCP Fallback start time: 00:00:00
        Last MGCP Fallback end time:    00:00:00
        PRI Backhaul Link info
         Link Protocol:    TCP
         Remote Port Number: 2428
         Remote IP Address: 10.16.240.124
         Current Link State: OPEN
         Statistics:
           Packets recvd: 32
           Recv failures: 0
           Packets xmitted: 32
           Xmit failures: 0
         PRI Ports being backhauled: Slot 1, port 0
        !
        Configuration Auto-Download Information 
        =======================================
        No configurations downloaded
        Current state: Automatic Configuration Download feature is disabled                          Configuration Error History:
        FAX mode: cisco
        
        Step 2   show mgcp endpoints

        Use the show mgcp endpoints command to verify the status of the ports on the T1 interface, for example:



        Example:
        Router# show mgcp endpoints
        Interface T1 1/0
        !
        ENDPOINT-NAME          V-PORT  SIG-TYPE ADMIN
        S1/ds1-0/1@AV-2620-4   1/0:23    none     up                           S1/ds1-0/2@AV-2620-4   1/0:23    none     up                           S1/ds1-0/3@AV-2620-4   1/0:23    none     up                           S1/ds1-0/4@AV-2620-4   1/0:23    none     up                           S1/ds1-0/5@AV-2620-4   1/0:23    none     up                           S1/ds1-0/6@AV-2620-4   1/0:23    none     up                           S1/ds1-0/7@AV-2620-4   1/0:23    none     up                           S1/ds1-0/8@AV-2620-4   1/0:23    none     up                           S1/ds1-0/9@AV-2620-4   1/0:23    none     up                           S1/ds1-0/10@AV-2620-   1/0:23    none     up                           S1/ds1-0/11@AV-2620-   1/0:23    none     up                           S1/ds1-0/12@AV-2620-   1/0:23    none     up                           S1/ds1-0/13@AV-2620-   1/0:23    none     up                           S1/ds1-0/14@AV-2620-   1/0:23    none     up                           S1/ds1-0/15@AV-2620-   1/0:23    none     up                           S1/ds1-0/16@AV-2620-   1/0:23    none     up                           S1/ds1-0/17@AV-2620-   1/0:23    none     up                           S1/ds1-0/18@AV-2620-   1/0:23    none     up                           S1/ds1-0/19@AV-2620-   1/0:23    none     up                           S1/ds1-0/20@AV-2620-   1/0:23    none     up                           S1/ds1-0/21@AV-2620-   1/0:23    none     up                           S1/ds1-0/22@AV-2620-   1/0:23    none     up                           S1/ds1-0/23@AV-2620-   1/0:23    none     up
        
        Step 3   debug ccm-manager backhaul

        Use the debug ccm-manager backhaul command to verify that the NSF messages are backhauled correctly between the gateway and Cisco Unified Communications Manager, for example:



        Example:
        Router# debug ccm-manager backhaul events
        !
        Call Manager backhaul events debugging is ON.
        !
        3:05:20:
        1w0d:
        cmbh_rcv_callback: <-- Receiving backhaul msg for Se1/1:23 :
        	| bk_msg_type = DATA_REQ
        	| bk_chan_id (slot:port) = 1:1
        	| Q.931 length = 52
        	| Q.931 message type: SETUP
        	| Q.931 message = 080200040504038090A21803A983971E028083200604A1323838E7
        

        The bold portion of the above number is the NSF related information in the setup message of the backhaul packet.



        Example:
        					  28086E616D65343430316C0600813434303170058039393939
        1w0d:
        cmbrl_send_pak: >-- Sending backhauled msg for Se1/1:23 :
        	| bk_msg_type = DATA_IND
        	| bk_chan_id (slot:port) = 1:1
        	| Q.931 length = 12
        	| Q.931 message type: STATUS
        	| Q.931 message = 080280047D080280E4140101
        1w0d:
        cmbrl_send_pak: --> Sending backhauled msg for Se1/1:23 :
        	| bk_msg_type = DATA_IND
        	| bk_chan_id (slot:port) = 1:1
        	| Q.931 length = 10
        	| Q.931 message type: CALL PROCEEDING
        	| Q.931 message = 08028004021803A98397
        1w0d:
        cmbrl_send_pak: --> Sending backhauled msg for Se1/1:23 :
        	| bk_msg_type = DATA_IND
        	| bk_chan_id (slot:port) = 1:1
        	| Q.931 length = 9
        	| Q.931 message type: PROGRESS
        	| Q.931 message = 08028004031E028188
        1w0d:
        cmbrl_send_pak: --> Sending backhauled msg for Se1/1:23 :
        	| bk_msg_type = DATA_IND
        	| bk_chan_id (slot:port) = 1:1
        	| Q.931 length = 9
        	| Q.931 message type: CONNECT
        	| Q.931 message = 08028004071E028182
        1w0d:
        cmbh_rcv_callback: <-- Receiving backhaul msg for Se1/1:23 :
        	| bk_msg_type = DATA_REQ
        	| bk_chan_id (slot:port) = 1:1
        	| Q.931 length = 5
        	| Q.931 message type: CONNECT ACK
        	| Q.931 message = 080200040F
        1w0d:
        cmbrl_send_pak: --> Sending backhauled msg for Se1/1:23 :
        	| bk_msg_type = DATA_IND
        	| bk_chan_id (slot:port) = 1:1
        	| Q.931 length = 9
        	| Q.931 message type: DISCONNECT
        	| Q.931 message = 080280044508028290
        1w0d:
        cmbh_rcv_callback: <-- Receiving backhaul msg for Se1/1:23 :
        	| bk_msg_type = DATA_REQ
        	| bk_chan_id (slot:port) = 1:1
        	| Q.931 length = 5
        	| Q.931 message type: RELEASE
        	| Q.931 message = 080200044D
        1w0d:
        cmbrl_send_pak: --> Sending backhauled msg for Se1/1:23 :
        	| bk_msg_type = DATA_IND
        	| bk_chan_id (slot:port) = 1:1
        	| Q.931 length = 5
        	| Q.931 message type: RELEASE COMPLETE
        	| Q.931 message = 080280045A
        
        Step 4   debug isdn q931

        Use the debug isdn q931 command to display the ISDN Layer 3 processing, for example:



        Example:
        Router# debug isdn q931
        !
        debug isdn q931 is ON.
        1w0d: ISDN Se1/1:23 Q931: TX -> SETUP pd = 8 callref = 0x0003
                Bearer Capability i = 0x8090A2
                        Standard = CCITT
                        Transfer Capability = Speech
                        Transfer Mode = Circuit
                        Transfer Rate = 64 kbit/s
                Channel ID i = 0xA98397
                        Exclusive, Channel 23
                Progress Ind i = 0x8083 - Origination address is non-ISDN
                Net Specific Fac i = 0x04A1323838E7
                Display i = 'name4401'
                Calling Party Number i = 0x0081, '4401'
                        Plan:Unknown, Type:Unknown
                Called Party Number i = 0x80, '9999'
                        Plan:Unknown, Type:Unknown
        1w0d: ISDN Se1/1:23 Q931: RX <- STATUS pd = 8 callref = 0x8003
                Cause i = 0x80E4 - Invalid information element contents
                Call State i = 0x01
        1w0d: ISDN Se1/1:23 Q931: RX <- CALL_PROC pd = 8 callref = 0x8003
                Channel ID i = 0xA98397
                        Exclusive, Channel 23
        1w0d: ISDN Se1/1:23 Q931: RX <- PROGRESS pd = 8 callref = 0x8003
                Progress Ind i = 0x8188 - In-band info or appropriate now available
        1w0d: ISDN Se1/1:23 Q931: RX <- CONNECT pd = 8 callref = 0x8003
                Progress Ind i = 0x8182 - Destination address is non-ISDN
        1w0d: ISDN Se1/1:23 Q931: TX -> CONNECT_ACK pd = 8 callref = 0x0003
        1w0d: ISDN Se1/1:23 Q931: RX <- DISCONNECT pd = 8 callref = 0x8003
                Cause i = 0x8290 - Normal call clearing
        1w0d: ISDN Se1/1:23 Q931: TX -> RELEASE pd = 8 callref = 0x0003
        1w0d: ISDN Se1/1:23 Q931: RX <- RELEASE_COMP pd = 8 callref = 0x8003
        
        Note   

        For a description of the fields displayed in these output examples, see the Cisco IOS Voice Command Reference, Release 12.3T and the Cisco IOS Debug Command Reference, Release 12.3.


        Configuring QSIG Supplementary Features for Cisco IOS Voice Gateways

        There are no specific configuration tasks necessary to support QSIG features on the voice gateway except those described in the following Prerequisites section.

        Prerequisites

        • Cisco IOS Release 12.3(11)T or later
        • MGCP must be configured on the voice gateway. For information, see "Configuring MGCP Gateway Support for Cisco Unified Communications Manager" on page 23 .
        • ISDN PRI Backhaul must be configured on the MGCP gateway. For information, see the Configuring MGCP PRI Backhaul on the Cisco Voice Gateway.
        • QSIG signaling is required to support supplementary services over the T1 and E1 time-division multiplexing (TDM) trunks that support the PRI backhaul mechanism.
        • Cisco Catalyst 6500 series and Cisco 7600 series Communication Media Module (CMM) requires WS-SVC-CMM-6T1 or WS-SVC-CMM-6E1 port adapter.

        QSIG Supplementary Features for Cisco IOS Voice Gateways

        The QSIG protocol, a variation of ISDN PRI signaling that is used by PBXs, supports basic calls and supplementary services over TDM trunks. Cisco Unified Communications Manager can interoperate with PBXs using QSIG. The voice gateway supports QSIG over PRI backhaul interfaces. Call control is transparent to the voice gateway as all layer 3 messages are passed through PRI backhaul.

        These additional QSIG features and services are supported for Cisco Unified Communications Manager 4.0 (formerly known as Cisco CallManager 4.0) and later:

        • Call diversion (forwarding)
        • Call transfer
        • Identification services
        • Message waiting indication services
        Figure 1. QSIG and Supplementary Services Overview

        For more information about QSIG support in Cisco Unified Communications Manager, see the "Understanding IP Telephony Protocols" chapter in the Cisco Unified Communications Manager System Guide

        Configuration Examples for MGCP PRI Backhaul and T1 CAS


        Note


        To view relevant configuration examples, go to the Cisco Systems Technologies website at http:/​/​cisco.com/​web/​psa/​technologies/​index.html . From the website, select Voice > IP Telephony/VoIP, then click Configure> Configuration Examples and Tech Notes.


        MGCP PRI Backhaul and T1 CAS Example

        In the following example, T1 CAS and PRI backhaul is configured for an MGCP gateway:

        mgcp
        mgcp call-agent 10.0.0.21 service-type mgcp version 0.1
        mgcp dtmf-relay voip codec all mode out-of-band
        mgcp modem passthrough voip mode cisco
        mgcp modem passthrough voip codec g711alaw
        mgcp modem passthrough voip redundancy
        mgcp package-capability dtmf-package
        mgcp package-capability mf-package
        mgcp package-capability rtp-package
        mgcp package-capability sst-package
        mgcp default-package line-package
        mgcp timer net-cont-test 3000
        isdn switch-type primary-ni
        call rsvp-sync
        !
        ccm-manager fallback-mgcp 
        ccm-manager redundant-host 10.0.0.21
        ccm-manager mgcp
        ccm-manager music-on-hold
        ! This is the PRI backhaul circuit
        controller T1 3/0
         framing esf
         linecode b8zs
         pri-group 0 timeslots 1-24 service mgcp
        !
        ! This is the T1-CAS circuit
        controller T1 3/1
         framing esf
         linecode b8zs
         ds0-group 0 timeslots 1-24 type e&m-wink-start
        !
        interface Serial3/0:23
         no ip address
         no logging event link-status
         isdn switch-type primary-ts014
         isdn incoming-voice voice
         isdn T306 60000
         isdn bind-L3 ccm-manager
         no cdp enable
        !
        dial-peer voice 501 pots
         service mgcpapp
         incoming called-number 
         port 3/1:0

        Where to Go Next

        • To configure conferencing, transcoding, and MTP support on a Cisco IOS gateway, see "Configuring Enhanced Conferencing and Transcoding for Voice Gateway Routers" on page 67 .
        • To enable MGCP BRI backhaul support, see "Configuring MGCP-Controlled Backhaul of BRI Signaling in Conjunction with Cisco Unified Communications Manager" on page 129 .
        • To download region-specific tones and their associated frequencies, amplitudes, and cadences, see "Configuring Tone Download to MGCP Gateways" on page 145 .

        Additional References

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