Preconditions within re-INVITE is discussed within RFC 3312, RFC 6141, and RFC 4032. RFC 3725 may also be of interest since your use case sounds like 3PCC.
RFC 4032 section 4 discusses a 3PCC situation that you might hit. > -----Original Message----- > From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip- > implementors-boun...@lists.cs.columbia.edu] On Behalf Of amrita chaudhary > Sent: Friday, July 22, 2016 11:10 AM > To: sip-implementors@lists.cs.columbia.edu > Subject: [Sip-implementors] Precondition negotiation in re-INVITE > > Hi, > Is it possible to do precondition negotiation in re-INVITE when first leg > of > the call is established?Scenario: AS connects A-party to C-party after B- > party (which was in conversation with A) is released.A, B and C are VoLTE > terminals. > Does anybody has done this in their implementation. > > Regards,Amrita > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
