Thanks for the input, proxy-2 which is 3rd party sending early media without SDP info in pregress message(180 or 183).
On Tue, Oct 5, 2010 at 7:47 PM, Andreas Heise <aheise.li...@googlemail.com>wrote: > 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 >> > >
_______________________________________________ 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
