Hello All, I am having a bit peculiar problem with Asterisk 11 for a carrier. This carrier shares quite some information in SDP header, which should not be the problem, however what happen is as follow:
Carrier----> (INVITE) -> *SIP Proxy -> Asterisk 11 -> Answer()* -> right after answering call drops... Carrier send a BYE with (cause 79: service or option not implemented). *NOTE: Please refer to complete SIP traces attached. * * * *Also Note:* *Carrier*: 62.61.147.214 *Proxy*: 77.X.X.X:5060 *Asterisk11*: 77.X.X.X:5080 *Here is Invite SDP from Carrier -> Proxy -> Asterisk 11* INVITE sip:69609000@77.X.X.X SIP/2.0 v=0 o=AudiocodesGW 1638819008 1638818710 IN IP4 62.61.147.214 s=Phone-Call c=IN IP4 77.X.X.X t=0 0 m=audio 53372 RTP/AVP 8 118 18 a=rtpmap:8 PCMA/8000 a=rtpmap:118 PCMA/8000 a=gpmd:118 vbd=yes a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=ptime:20 a=sendrecv a=rtcp:53373 IN IP4 77.X.X.X m=image 56854 udptl t38 a=T38FaxVersion:0 a=T38MaxBitRate:14400 a=T38FaxMaxBuffer:1024 a=T38FaxMaxDatagram:122 a=T38FaxRateManagement:transferredTCF a=T38FaxUdpEC:t38UDPRedundancy *SDP:After Answered by Asterisk 11* v=0 o=root 164966782 164966782 IN IP4 77.X.X.X s=Asterisk v11.0.1 c=IN IP4 77.X.X.X t=0 0 m=audio 12636 RTP/AVP 18 8 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=rtpmap:8 PCMA/8000 a=ptime:20 a=sendrecv *m=image 0 udptl t38* I have tired by disabling/unloading fax modules as *I am not using* them but no results. Secondly, also tried tweaking of udptl ever-odd nothing worked. The same carrier works for Asterisk 1.6.X and the only difference I have notice so far is the above underlined line in Answered SDP -> m=image 0 udptl t38. I think if I some how do not advertise udptl here i would be able to avoid this scenario. I have tried multiple ways to strip off SDP from incoming INVITE at SIP Proxy level but it is not SDP wise enough. *Note:* In Asterisk 1.6 => WARNING[32671]: chan_sip.c:8833 process_sdp: Unsupported SDP media type in offer: image 59978 udptl t38 In Asterisk 11 => WARNING[18748][C-0000002f]: chan_sip.c:10277 process_sdp: Failed to initialize UDPTL, declining image stream -- Regards *Muhammad Salman Zafar*
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