Hello, you could change the SDP with UPDATE method, but 183 must be send reliable in this case.
regards, Andreas 2010/10/5 Iñaki Baz Castillo <i...@aliax.net> > 2010/10/4 Asim Riaz <aria...@gmail.com>: > > Hi List, > > Phone-1 ------->Proxy1 (kamailio)-------------->Proxy-2(3rd party) > > -------------> phone 2 > > > > Calls from phone-1 to phone-2, proxy-2 is sending early media without sdp > in > > provisional reply, this early media is sourced from different port than > > response (200), what port proxy-1 will use to transmit actual voice, the > > source port in early media or source port in response(200) which is > > different than early media. > > As Daniel said Kamailio doesn't handle media (it's a SIP proxy). You > should mean "Phone-1" instead of "proxy-1". > > According to the RFC about SDP (and also RFC 3261): during the same > early dialog (same To-tag) the SDP MUST NOT change. This is, if a UAS > generates a 183 (To-tag=1234) with SDP, it MUST use the same SDP in > other 183's responses and in final 200 OK response. > The client can receives multiple SDP (when there is a proxy doing > parallel forking, but each early dialog (same To-tag) MUST mantain a > fixed SDP. > > So, if the client receives a different SDP in the 200 than the SDP it > received in the 183 (I mean in the *same* early-dialog / same To-tag) > then the client MUST ignore others SDP but the first one received. I > insist: I'm speaking about the SDP in the SAME early-dialog. > > > > -- > Iñaki Baz Castillo > <i...@aliax.net> > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users@lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >
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