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
