A NOTE has been added to this issue. ====================================================================== https://bugtracker.iptel.org/view.php?id=73 ====================================================================== Reported By: jh Assigned To: ====================================================================== Project: SEMS Issue ID: 73 Category: SBC Reproducibility: always Severity: major Priority: normal Status: new ====================================================================== Date Submitted: 2012-03-02 04:13 CET Last Modified: 2012-03-27 12:30 CEST ====================================================================== Summary: duplicate audio section in sbc session timer re-invites Description: when sbc is using session timer, re-invites after the first one (packet 8) contain duplicate sdp audio section (packets 11 and 12).
also, re-invite in packet 12 to a leg uac should not have been sent so soon as the previous one to the same uac (packet 8) was sent within the same second. ====================================================================== ---------------------------------------------------------------------- (0000113) jh (reporter) - 2012-03-03 03:38 https://bugtracker.iptel.org/view.php?id=73#c113 ---------------------------------------------------------------------- Correction: the first re-invite that includes duplicate audio section (packet 11) is sent by sems echo server at b leg. i guess that explains why following re-invites from sems sbc contain the same sdp. so looks like the bug is in echo server session timer. rtp relaying is not enabled. ---------------------------------------------------------------------- (0000115) jh (reporter) - 2012-03-03 21:03 https://bugtracker.iptel.org/view.php?id=73#c115 ---------------------------------------------------------------------- i uploaded debug output from sems echo server that shows the original invite it received as well as the re-invite it sent. original invite has two sdp media parts: audio and video. since sems echo plugin does not support video, it included in 200 ok an inactive video part. but when it sent the session timer re-invite, this inactive video media part got replaced by another audio media part, which causes the problem. it should just use the saved copy of sdp body from its 200 ok to the initial invite if there is one somewhere. ---------------------------------------------------------------------- (0000116) jh (reporter) - 2012-03-27 12:30 https://bugtracker.iptel.org/view.php?id=73#c116 ---------------------------------------------------------------------- i think i found why sdp of re-invite from sems echo server contains two audio sections. when sems replied to original invite that included both audio and media sections in sdp, 200 ok had this kind of sdp: Media Description, name and address (m): audio 40004 RTP/AVP 100 10 3 9 8 0 104 Media Attribute (a): rtpmap:100 speex/16000 Media Attribute (a): fmtp:100 mode="7";vbr=off;cng=on Media Attribute (a): rtpmap:103 speex/8000 Media Attribute (a): fmtp:103 mode="7";vbr=off;cng=on Media Attribute (a): rtpmap:9 g722/8000 Media Attribute (a): rtpmap:8 PCMA/8000 Media Attribute (a): rtpmap:0 PCMU/8000 Media Attribute (a): rtpmap:104 telephone-event/8000 Media Attribute (a): fmtp:104 0-15 Media Attribute (a): direction:passive Media Attribute (a): sendrecv Media Description, name and address (m): video 0 RTP/AVP 96 Media Attribute (a): inactive when sems then sends out session timer re-invite, it calls AmSession::getSdpOffer with an offer that has two media sections: Mar 27 13:14:47 node1 sems[12654]: [#b54eab70] [getSdpOffer, AmSession.cpp:970] INFO: Before offer media (port 40000, payloads: 100 103 9 8 0 104) Mar 27 13:14:47 node1 sems[12654]: [#b54eab70] [getSdpOffer, AmSession.cpp:970] INFO: Before offer media (port 0, payloads: 96) then AmSession::getSdpOffer makes this kind of call: RTPStream()->getSdpOffer(RTPStream()->getSdpMediaIndex(), offer.media.back()); and after that the offer looks wrongly like this: Mar 27 13:14:48 node1 sems[12654]: [#b54eab70] [getSdpOffer, AmSession.cpp:983] INFO: After offer media (port 40000, payloads: 100 103 9 8 0 104) Mar 27 13:14:48 node1 sems[12654]: [#b54eab70] [getSdpOffer, AmSession.cpp:983] INFO: After offer media (port 40000, payloads: 101 102 8 0 3 2 9 96 97 98 99 100) questionss: why is the last (= second) media section corresponding to the unsupported video stream passed to RTPStream()->getSdpOffer and why is it replaced by port 40000, payloads: 101 102 8 0 3 2 9 96 97 98 99 100? why is AmRtpAudio::getSdpOffer overwriting offer type to audio: void AmRtpAudio::getSdpOffer(unsigned int index, SdpMedia& offer) { offer.type = MT_AUDIO; INFO("Getting sdp offer for index %u, offer '%s'\n", index, offer.debugPrint().c_str()); AmRtpStream::getSdpOffer(index,offer); } -- juha Issue History Date Modified Username Field Change ====================================================================== 2012-03-02 04:13 jh New Issue 2012-03-02 04:13 jh File Added: timer.pcap 2012-03-03 03:38 jh Note Added: 0000113 2012-03-03 03:39 jh Note Added: 0000114 2012-03-03 03:43 jh Note Deleted: 0000114 2012-03-03 20:55 jh File Added: echo.debug 2012-03-03 21:03 jh Note Added: 0000115 2012-03-27 12:30 jh Note Added: 0000116 ====================================================================== _______________________________________________ Semsdev mailing list [email protected] http://lists.iptel.org/mailman/listinfo/semsdev
