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[MS-SDP]: Audio/Video Encryption | Microsoft Docs
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-sdp/c48d8b88-ac53-4a1b-929b-8c6cbbb3b191
If encryption is not allowed, SDP signaling MUST carry a media-level attribute as shown in the following. m=audio 49170 RTP/AVP 0 a=encryption:rejected. The encryption key to use MUST be carried in a media-level key parameter, as shown in the following example.
RFC 4566 - SDP: Session Description Protocol
https://tools.ietf.org/html/rfc4566
This is completely defined in the RTP Audio/Video profile as payload type 0, so there is no need for an "a=rtpmap:" attribute, and the media for such a stream sent to UDP port 49232 can be specified as: m=audio 49232 RTP/AVP 0 An example of a dynamic payload type is 16-bit linear encoded stereo audio sampled at 16 kHz.
Understanding Session Description Protocol (SDP) | Tao ...
https://andrewjprokop.wordpress.com/2013/09/30/understanding-session-description-protocol-sdp/
The following is an example of an actual SDP message. v=0. o=Andrew 2890844526 2890844526 IN IP4 10.120.42.3. 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
Now you know Sdp M=Audio 0
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