Hello Friends, I am facing the problem with one of my client. I can see we are getting the 2 codecs in SDP(G.711 & G.729) with payload "0, 101, 19".
Now here is my doubt is that whenver my client is sending the SDP in initial OFFER with G.729 its offering "Media format = 0".But when i checked the RFC 3264 and others, then i observed that it can be possible if you have two codecs in one SDP then one media format can be "0". Below is the OFFERED SDP from my SOURCE UA. Media Description, name and address (m): audio 17890 RTP/AVP 0 101 19 Media Type: audio Media Port: 17890 Media Protocol: RTP/AVP Media Format: ITU-T G.711 PCMU Media Format: DynamicRTP-Type-101 Media Format: Comfort noise (old) Connection Information (c): IN IP4 212.48.160.163 Connection Network Type: IN Connection Address Type: IP4 Connection Address: 212.48.160.163 Media Attribute (a): rtpmap:0 PCMU/8000 Media Attribute Fieldname: rtpmap Media Format: 0 MIME Type: PCMU Sample Rate: 8000 Media Attribute (a): rtpmap:101 telephone-event/8000 Media Attribute Fieldname: rtpmap Media Format: 101 MIME Type: telephone-event Sample Rate: 8000 Media Attribute (a): fmtp:101 0-16 Media Attribute Fieldname: fmtp Media Format: 101 [telephone-event] Media format specific parameters: 0-16 Media Attribute (a): rtpmap:19 CN/8000 Media Attribute Fieldname: rtpmap Media Format: 19 MIME Type: CN Sample Rate: 8000 Media Attribute (a): ptime:20 Media Attribute Fieldname: ptime Media Attribute Value: 20 Here is SDP is offered by my Remote Entity in 183 Session progress in the correspondence of of INITIAL INVITE. Media Description, name and address (m): audio 5870 RTP/AVP 0 101 Media Type: audio Media Port: 5870 Media Protocol: RTP/AVP Media Format: ITU-T G.711 PCMU Media Format: DynamicRTP-Type-101 Media Attribute (a): rtpmap:0 PCMU/8000 Media Attribute Fieldname: rtpmap Media Format: 0 MIME Type: PCMU Sample Rate: 8000 Media Attribute (a): sendrecv Media Attribute (a): rtpmap:101 telephone-event/8000 Media Attribute Fieldname: rtpmap Media Format: 101 MIME Type: telephone-event Sample Rate: 8000 Now the problem which i am facing is that after doing the Negotiation and the ACK of 200 OK in the correspondence in INITIAL OFFER/INVITE, i am getting a BYE immediately from my source UA. Could anyone please help me to diagnose this. Thanks, Nitin kapoor _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
