See RFC 3261, RFC 3264, and RFC 6337 concerning offer/answer model and failure responses such as 488.
> -----Original Message----- > From: [email protected] [mailto:sip- > [email protected]] On Behalf Of Vineet Menon > Sent: Monday, February 06, 2012 11:50 AM > To: [email protected] > Subject: [Sip-implementors] Capability negotiation in SIP > > Hi, > > Can somebody tell me what is the scope of capability negotiation in > SIP? > Take this scenario, > A --------------------Invite with H.264 > codec------- > B > A <------------------200 OK with H.261 > codec----- A > > What will be the codec used in this case? > > I believe I have assumes that SIP sends only one codec once rather than > a > set of them! So I expect the call to get rejected!!! > > Am I correct?? And waht kind of message is sent to indicate that > capability > negotiation has failed? > > > Regards, > > Vineet Menon _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
