RFC 4028 describes Session Timers in SIP. RFC 3264, 4317, 4566, 6337 describe SDP as well as SDP offer/answer model.
RFC 6141 describes Re-INVITE and Target-Refresh Request Handling in the Session Initiation Protocol (SIP). Hope this helps _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
