As long as it is RTP we will have MOS IF!!! and ONLY IF!!! we have one of two things:
1 - Call Setup Packets which tell Observer the codec type used by the RTP data streams.
2 - Without the presence of Call Setup Packets the codec type is a known type, a type between 0 and 34
https://en.wikipedia.org/wiki/RTP_payload_formats
Wikipedia SearchRTP payload formatsMedia Type Registration of Payload Formats in the RTP Profile for Audio and Video Conferences RFC 3190, RTP Payload Format for 12-bit DAT Audio and 20-
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