> I'm afraid we're over-engineering this whole thing, and we'll > end up with something which is even more complicated than what > we are trying to clarify :) I agree. I think that the complication is less about the RFC ambiguity and more about vendors attempting to find ways to interop when some devices don't support (or disabled support of) the following: 1) interactions with forking proxies, 2) rfc3262, or 3) rfc3311. Devices which don't support the above 3 items usually need work-a-rounds which are not compliant to SIP's offer/answer rules. Thus fixing potential RFC ambiguity does little to fix the real problem beyond highlighting that most/all of the work-a-rounds are non compliant or not desirable. _______________________________________________ Sipping mailing list https://www.ietf.org/mailman/listinfo/sipping This list is for NEW development of the application of SIP Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip Use sip@xxxxxxxx for new developments of core SIP