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Troubleshoot Fax Failures Due to Multiple M-Lines on the ...
https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-border-element/118939-technote-cube-00.html#:~:text=Now%2C%20if%20a%20provider%20sends%20an%20SDP%20with,to%20the%20fax%20server%20in%20the%20Invite%20message.
[Sip-implementors] Multiple 'm' lines in SDP and the ...
https://lists.cs.columbia.edu/pipermail/sip-implementors/2007-May/016491.html
Consider an INVITE with the following SDP: ... c=IN IP4 1.2.3.4 m=audio 54678 RTP/AVP 0 1 3 m=video 7346 RTP/AVP 28 31 (face) m=video 7880 RTP/AVP 26 28 (presentation) If the response contained something like ... c=IN IP4 3.4.5.6 m=audio 6540 RTP/AVP 0 1 m=video 6578 RTP/AVP 28 the caller would not be able to tell which of the two offered video streams …
WebRTC - SDP has more m= line - Stack Overflow
https://stackoverflow.com/questions/54380165/webrtc-sdp-has-more-m-line
Since B has two media streams SDP will contain 4 m lines (2 per stream). In Unified Plan every single media track is assigned to a separate “m=” section. If you use multiple media tracks, multiple “m=” sections are created. Chrome is migrating to unified plan from plan-b
Understanding Session Description Protocol (SDP) | Tao ...
https://andrewjprokop.wordpress.com/2013/09/30/understanding-session-description-protocol-sdp/
s= SDP Blog. c=IN IP4 10.120.42.3. t=0 0. m=audio 49170 RTP/AVP 0 8 97. a=rtpmap:0 PCMU/8000. a=rtpmap:8 PCMA/8000. a=rtpmap:97 iLBC/8000. m=video 51372 RTP/AVP 31 32. a=rtpmap:31 H261/90000. Unless you’ve been working with SIP and SDP for a while, this probably looks pretty undecipherable.
[Sip-implementors] Multiple 'm' lines in SDP and the ...
https://lists.cs.columbia.edu/pipermail/sip-implementors/2007-May/016487.html
> > However in practice, refusing an SDP like this: >>> c=IN IP4 3.4.5.6 >>> m=audio 6540 RTP/AVP 0 1 >>> m=video 6578 RTP/AVP 28 > > is a bit too strict, in my opinion. > > Even though the number of m= lines is less than the "previous SDP", > it is still obvious what the offerer wants and the syntax of > the SDP is still ok.
[Sip] m= lines with multiple ports
https://www.ietf.org/mail-archive/web/sip/current/msg01367.html
Hi, More on the SIP media handling discussion. At the moment, I think most people agree that the number of m= lines in the request and response MUST match. Now, SDP allows the including of multiple ports (so called port pairs) in a single m= line, so the UAC may send: m=audio 2000/2 RTP/AVP 31 Now, there are a few scenarios: 1.
Description of Media parameter in SIP "m=audio 12548 …
https://stackoverflow.com/questions/27869523/description-of-media-parameter-in-sip-m-audio-12548-rtp-avp-0-8-101
This answer is not useful. Show activity on this post. It's a field from SDP protocol, describing parameters of media ("m" is for "media"). Next, type of media is "audio", not video, for example. (m=audio). 12548 is a port address for streaming media. "RTP/AVP" means "RTP Audio/Video Profile" and representing one of RTP profiles, which are coded by 0, 8 and 101. 0 is …
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