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When the

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 receives

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When the SBC receives a 200-class response to a REGISTER request from the SIP Registrar, it stores the received Service-Route header value but does not include a Service-Route header when sending the response to the SIP endpoint. SIP INVITE requests from the SIP Registrar include a reg-info parameter in the Request-URI. SBC checks The

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 checks for the presence of the reg-info parameter when processing INVITE Request-URIs. Support for the reg-info parameter is needed to determine the direction of a call when using hop-by-hop routing.

When SBC receives the

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 receives an INVITE request not containing a reg-info parameter in the Request-URI, it determines that the request was sent by a SIP endpoint. The SBC converts

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 converts the Service-Route header saved from the 200-class response to the REGISTER request for the SIP endpoint into a Route header and includes the Route header in the outgoing INVITE request to the SIP Registrar.

When the SBC receives

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 receives an INVITE request containing a reg-info parameter in the Request-URI, it determines that the request was sent by the SIP Registrar. The SBC does

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 does not include the Route header in the outgoing INVITE request to the SIP endpoint.

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• Create Service Route Header—If enabled, SBC creates the

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   creates a Service-Route header in outgoing SIP messages. If “Add Service Route Per TG” is also enabled, SBC pushes the

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   pushes two Service Route headers before forwarding a 200 - class response to REGISTER. The first Service Route header contains ingress SIP signaling address and trunk group information; the second Service Route header contains egress SIP signaling address and trunk group information (default is ‘disable’).

  Code Block
  % set profiles signaling ipSignalingProfile <profile> commonIpAttributes flags createServiceRouteHeader <disable | enable>

• Store Service Route Header—Controls whether a SBC stores

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   stores/caches locally the Service-Route headers received in a 200-class response to a REGISTER request (default is ‘disable’).

  Code Block
  % set profiles signaling ipSignalingProfile <profile> commonIpAttributes flags storeServiceRouteHeader <disable | enable>

• Service Route Header Transparency Flag—If set, SBC transparently the

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   transparently passes the received Service Route headers (default is ‘disable’).

  Code Block
  % set profiles signaling ipSignalingProfile <profile> commonIpAttributes transparencyFlags serviceRouteHeader <disable | enable>

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