> What should be the behavior of an UAS upon receiving an INVITE > request with Supported:timer, no Session-Expires header and a > Min-SE header with a value lower than the configured value of > Min-SE? > > UAC ----> INVITE with Min-SE: 90 -----> UAS ( Configured Min-SE: 100)
The following snippets are applicable. Concerning the locally configured Min-SE in relation to locally configured preferred Session-Expires (if that is the question), my understanding is that the RFC leaves it up to the vendors to decide if the locally configured Min-SE would or would not override the locally preferred Session-Expires (especially since it is likely an atypical configuration for the local preferred to be lower than the local minimum). RFC 4028 section 9: "If the incoming request contains a Supported header field with a value 'timer' but does not contain a Session-Expires header, it means that the UAS is indicating support for timers but is not requesting one. The UAS may request a session timer in the 2XX response by including a Session-Expires header field. The value MUST NOT be set to a duration lower than the value in the Min-SE header field in the request, if it is present." "The fourth row of Table 2 describes a case where both the UAC and UAS support the session timer extension, and where the UAC did not select who will perform refreshes. This allows the UAS to decide whether it or the UAC will perform the refreshes." _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
