Configuration of SIP Trunking for PSTN Access (SIP-to-SIP) Configuration Guide, Cisco IOS XE Release 3S
Configuring SIP Trunk Registration
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Configuring SIP Trunk Registration

Configuring SIP Trunk Registration

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 SIP Trunk Registration

Cisco Unified Border Element (Enterprise)

  • Cisco IOS XE Release 3.7S or a later release must be installed and running on your Cisco ASR 1000 Series Router

Restrictions for SIP Trunk Registration

  • If the INVITE transaction with preloaded outbound-proxy & route header fails because of no response, socket errors, or 4xx/5xx/6xx response, the call will fail. Subsequent calls may also fail if the same error condition occurs until a re-registration request updates the cached outbound-proxy and service-route with alternate P-CSCF/S-CSCF information. Failed calls do not cause a forced re-registration to update the outbound-proxy and service-route information; the registration retry timer needs to expire for re-registration to be initiated
  • Only a single registrar command configuration is recommended for this feature. If multiple registrar commands are configured, the outbound call selects the first registrar to which the associated registered-number is registered with.
  • The 200 OK response to initial INVITE should contain Record-Route header with outbound proxy IP address and Port used for sending INVITE as host-port in the topmost Record-Route header. The 200 OK response to initial INVITE overrides outbound proxy configuration for the future requests in the dialog. If the 200 OK response to initial INVITE does not contain Record-Route, subsequent requests are sent directly to the remote target.
  • This feature does not involve any transport protocols. Feature functionality uses the following registration support:

    Mode

    Outbound Proxy Support

    Primary/secondary registrar mode

    IPv4 and IPv6

    Multiple registrar mode

    IPv4

    DHCP mode

    IPv4

Information about SIP Trunk Registration

The Cisco IOS gateway registers all its POTS dial peers to the registrar when the registrar is configured on the Gateway. The introduction of trunk registration support, the registration of a single number would represent the SIP trunk. The SIP trunk registration can then be associated with multiple dial-peers for routing outbound calls. This registration represents all of the gateway end points for routing calls from or to the endpoints.

The Cisco IOS SIP gateway sends the REGISTER request to the configured registrar after resolving the outbound-proxy DNS name. Upon successful registration the Cisco IOS SIP gateway re-uses the Outbound Proxy IP address, port number, service-route response received for sending subsequent REGISTER/INVITE.

How to Configure SIP Trunk Registration

Enabling the Outbound Proxy for Reuse

The existing enabling the outbound proxy CLI would be extended to turn on/off using the resolved IP address and port for a successful registration to all the subsequent outbound INVITE/REGISTER.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    voice service voip

    4.    sip

    5.    outbound-proxy dns:host:domain reuse


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 configuration mode and to specify a voice-encapsulation type

     
    Step 4 sip


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

    Enters the Session Initiation Protocol (SIP) configuration mode

     
    Step 5 outbound-proxy dns:host:domain reuse


    Example:
    Device(config-voi-srv)# outbound-proxy dns:ob.proxy.cisco.com reuse  
    
     

    Configure a SIP outbound proxy address established during registration for all subsequent registration refreshes and calls.

     

    Example: Outbound Proxy Configuration

    voice service voip 
     fax protocol cisco 
     sip
      rel1xx disable
       outbound-proxy dns:rdc01pcscfgm.ims.voip.hrndva.rr.com
      no update-callerid
      authenticate redirecting-number
      sip-profiles 100

    Configuring Trunk Registration

    Use the following global or dia-peer configurations to associate a number with a dial-peer. When configured, the registration corresponding to this number is used for sending the OOD INVITE.

    Configuring Trunk Registration at the Global Level

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    voice service voip

      4.    sip

      5.    associateregistered-numbernumber

      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 the Session Initiation Protocol (SIP) configuration mode.

       
      Step 5associateregistered-numbernumber


      Example:
      Device(conf-serv-sip)# associate registered-number 1234
      
       

      Associates the preloaded route and outbound proxy details with the registered number.

       
      Step 6 exit


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

      Exits the current mode.

       

      Configuring Trunk Registration at the Dial Peer Level

      SUMMARY STEPS

        1.    enable

        2.    configure terminal

        3.    dial-peer voice tag voip

        4.    voice-class sip associate registered-number tag system

        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 tag voip


        Example:
        Device(config)# voice service voip
        
         

        Enters dial-peer voice configuration mode.

         
        Step 4voice-class sip associate registered-number tag system


        Example:
        Device(config-dial-peer)#voice-class sip associate registered-number 4321
        
         

        Associates the preloaded route and outbound proxy details with the registered number.

         
        Step 5 exit


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

        Exits the current mode.

         

        Enabling the Authorization Header

        Use the following configuration to enable or disable authorization header support in REGISTER requests and associate the realm with the register. The configured private-id of the user is used for populating authorization header.

        SUMMARY STEPS

          1.    enable

          2.    configure terminal

          3.    sip-ua

          4.    registrar registrar-server-address: ip-address auth-realm

          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 sip-ua


          Example:
          Device(config)# sip-ua
          
           

          Enters the SIP user-agent configuration mode.

           
          Step 4registrar registrar-server-address: ip-address auth-realm


          Example:
          Device(config-sip-ua)#registrar ipv4:209.165.1.1 auth-realm name.com
          
           

          Specifies the realm for preloaded authorization.

           
          Step 5 exit


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

          Feature Information for SIP Trunk Registration

          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 SIP Trunk Registration

          Feature Name

          Releases

          Feature Information

          SIP Trunk Registration

          15.1(2)T

          The SIP trunk registration support registration of a single number represents the SIP trunk and allows the SIP trunk registration to be associated with multiple dial-peers for routing outbound calls. This registration represents all the gateway end points for routing calls from or to the endpoints.

          The following commands were introduced or modified: associate registered-number,outbound-proxy, voice-class sip associate registered-number, registrar.

          SIP Trunk Registration

          Cisco IOS XE Release 3.7S

          The SIP trunk registration support registration of a single number represents the SIP trunk and allows the SIP trunk registration to be associated with multiple dial-peers for routing outbound calls. This registration represents all the gateway end points for routing calls from or to the endpoints.

          The following commands were introduced or modified: associate registered-number,outbound-proxy, voice-class sip associate registered-number, registrar.