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.
Thanks,
Asim
Hello,
On 10/4/10 2:36 PM, Asim Riaz wrote:
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.
kamailio is not relaying media - you can use rtpproxy together with it to do that.
Cheers, Daniel
Hi Daniel,
kamailio is not relaying media - you can use rtpproxy together with it to do
that.
Sorry forgot to mention I am using the mediaproxy to relay the media, I can see when Kamailio receive response(200) with different port than early media, mediaproxy sends one packet to the new port and then change back to the old port from which it was receiving early media. I am not sure but I don’t see any problem with the signaling so is it something to do with mediaproxy?
Thanks,
Asim
2010/10/4 Asim Riaz ariaz78@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.
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 ibc@aliax.net
2010/10/4 Asim Riaz ariaz78@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 ibc@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
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.lists@googlemail.comwrote:
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 ibc@aliax.net
2010/10/4 Asim Riaz ariaz78@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 ibc@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
-
Andreas Heise -
Asim Riaz -
Daniel-Constantin Mierla -
Iñaki Baz Castillo