Hi, at the moment I am facing a problem with session timer expiration in if sofia-sip is not the refresher.
The scenario is as follows: A sip client based on sofia-sip sends an INVITE to a proxy (not sofia-sip) with SESSION-EXPIRES:400. The Proxy answers with SESSION-EXPIRES=400;refresher=uas Now nua sends a bye with session timeout to the proxy after 400-400/3 -32 (approximately 235) seconds. This is too early in my opinion. RFC 4028 Section 10 says: "Similarly, if the side not performing refreshes does not receive a session refresh request before the session expiration, it SHOULD send a BYE to terminate the session, slightly before the session expiration. The minimum of 32 seconds and one third of the session interval is RECOMMENDED." This has been referenced in nua_session.c in function session_timer_set and the following calculations are done: interval -= 32 >interval / 6 ? interval / 3 : 32 + interval /3 I think the RFC could also be interpreted as: interval -= 32 > interval / 3 ? interval / 3 : 32; Maybe the RFC is a bit unclear here, but the second code line should be more tolerant with user agents that don't refresh the session at half of the expiration time (which is recommended by the RFC). This way some call interruptions could be prevented. Best Regards, Timo _________________________________________________________________________ Sensationsangebot nur bis 30.11: WEB.DE FreeDSL - Telefonanschluss + DSL für nur 16,37 Euro/mtl.!* http://dsl.web.de/?ac=OM.AD.AD008K13805B7069a ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Sofia-sip-devel mailing list Sofia-sip-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sofia-sip-devel
