This one was asked before, and is one of the infinite error scenarios Jonathan refers to from time to time that the spec can't cover. The unexpected response (any of the ones you mention) are simply ignored. The UAS eventually times out. The UAS might also send a BYE if the timed out transaction was an Invite, which you then send a 481 to.
John Hearty Level3 -----Original Message----- From: Murali Medikonda [mailto:[EMAIL PROTECTED]] Sent: Friday, April 12, 2002 9:21 AM To: [EMAIL PROTECTED] Subject: [Sip-implementors] unknown response handling All, I have a question on UAC behaviour when it receives unknown response. I've quickly browsed through the archives and bis09 for a proper answer and wasnt successful. I'd appreciate any insight into this. Here are the scenarios: 1. UAC sends an INVITE < UAS responds with 100 Trying and/or 1 or more 18x messages> UAC client is abnormally terminated, loses all the call context and comes back into service. UAS, unaware of UAC's termination, responds with a 200OK What is the correct behaviour for a UAC in such a scenario ? Section 8.1.3.2 (bis09) seems to indicate that UAC would send an ACK for the 200OK - am I reading this correctly? - which doesnt make sense ?? 2. What if the UAC sent a non-INVITE request and goes down and comes back into service, UAS, unaware, sends a response (2xx). How would UAC respond in that case? Also, in either case, what is the correct behaviour if the response were a 4xx, 5xx or 6xx as opposed to 200? thanks! Murali _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
