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UNDERSTANDING SIP TRACES - Cisco Community
https://community.cisco.com/t5/collaboration-voice-and-video/understanding-sip-traces/ta-p/3137704
m=audio 25268 RTP/AVP 18 0 8 101 . This line defines the media attribtes that will be used for the call. Audio: means that this is an Audio call, we can also have m=video in case of a Video call. 25268: Is the dynamic RTP port used for the call. RTP/AVP: Represents the RTP/AVP profile number for each of the profiles listed.
VoIP Protocols: SIP - Session Description Protocol
http://toncar.cz/Tutorials/VoIP/VoIP_Protocols_SIP_Session_Description_Protocol.html
m= media type, format, and transport address: m=<media> <port> <transport> <format list> In our example message, this is: m=audio 11424 RTP/AVP 0 8 101 The <media> is either "audio" or "video" (if the call contained both audio and video
Knowledgebase Article: SmartMedia: SDP profile ...
https://www.patton.com/support/kb_art.asp?art=408
m=audio 0 RTP/AVP 0 8 101 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=silenceSupp:off - - - - Below is a direct SIP INVITE with T.38. This can be useful if you know this route will always be with fax. It also doesn't require any IVR resources to detect the fax tones:
RFC 4733 - RTP Payload for DTMF Digits, Telephony Tones ...
https://tools.ietf.org/html/rfc4733
m=audio 12344 RTP/AVP 99 a=rtpmap:99 pcmu/8000 m=audio 12346 RTP/AVP 100 101 a=rtpmap:100 red/8000/1 a=fmtp:100 101/101/101 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 When used in accordance with the offer-answer model (RFC 3264 ), the SDP a=ptime: attribute indicates the packetization period that the author of the session description …
Modifying the m and a lines in SDP using SIP Message ...
https://support.sonus.net/display/UXDOC70/Modifying+the+m+and+a+lines+in+SDP+using+SIP+Message+Manipulation
In this particular instance, an incoming SDP used 116 for the DTMF event instead of the standard 101. The SMM configuration below repairs both the media (m line) and the attributes (a line) to modify 116 to 101. m=audio 28048 RTP/AVP 18 116 c=IN IP4 41.87.234.68 a=rtpmap:18 G729/8000 a=rtpmap:116 telephone-event/8000
sip - Using SDP media type application with RTP/AVP (m ...
https://stackoverflow.com/questions/48015713/using-sdp-media-type-application-with-rtp-avp-m-application-port-rtp-avp-p
I am trying to get familiar with the anatomy of a SIP SDP. Here is a sample SDP from my Tandberg VC unit. v=0 o=tandberg 1 3 IN IP4 192.168.1.94 s=- …
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