We have collected the most relevant information on M=Audio 0 Rtp/Avp 8 101. Open the URLs, which are collected below, and you will find all the info you are interested in.
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> <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, there would be two "m=" lines).
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:
Now you know M=Audio 0 Rtp/Avp 8 101
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