P-Associated-URI Header

In the SIP registration process, the registrar often returns a set of associated URIs for a registering AoR. When the Oracle Communications Unified Session Manager receives the list of associated URIs, it stores them in the registration entry for the registering endpoint. The service provider allocates one or more associated URIs per user for his or her own usage. After an endpoint successfully registers, the P-Associated-URI header returned in a 200 OK message informs the UE of all URIs associated with the AoR.

When the Oracle Communications Unified Session Manager receives a request from a UE, the URI in the From header is matched against the registration cache for that endpoint. If the registering endpoint matches an associated-URI already in the registration table, the Service-Route associated with this endpoint is used to create the route for originating transactions associated with the endpoint and the Oracle Communications Unified Session Manager.

The inclusion or exclusion of the P-Associated-URI header is not dependent on the trust level of an ingress or egress realm.