Hi, I am observing a behavior SDP negotiation. In the Below Example just After Media Negotiation. A is sending BYE without any media flow . Please refer the below call flow & my query.
A --------------------------- INVITE with SDP -------------------------> B ########## SDP details in Offer ############## v=0 o=- 1414764441 1414764441 IN IP4 172.29.62.182 s=Basic Session c=IN IP4 172.29.62.182 t=0 0 m=audio 37620 RTP/AVP 18 8 0 99 106 107 a=rtpmap:99 telephone-event/8000 a=fmtp:99 0-15 a=rtpmap:106 PCMU/8000 a=rtpmap:107 PCMA/8000 a=ptime:20 A <------------------------- 100 Trying -------------------------------------- B A <------------------------ 180 Ringing (unreliable)------------------------------------- B A <------------------------ 200 OK with SDP ------------------------------ B ########## SDP details in Answer ################ v=0 o=0000000000 37448557 1 IN IP4 172.29.62.11 s=- c=IN IP4 172.29.62.11 t=0 0 m=audio 53378 RTP/AVP 8 101 a=sendrecv a=ptime:20 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 A -------------------------- ACK -------------------------------------------> B A -------------------------- BYE ------------------------------------------> B the call is getting disconnected without any media transfer. I can see there are six codecs [ 18 8 0 99 106 107 ] with attribute for only for three [ 99 106 107 ] in SDP offer. Those three [ 99 106 107 ] only having rtpmap details. But in SDP answer two codec [ 8 101 ] with attribute for only [ 101 ]. The rtpmap is also for only [ 101 ]. So is the A is behaving correctly ? Whether there is failure in SDP negotiation? If yes then why? Regards, Sourav Dhar Chaudhuri _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
