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The WebRTC draft, or a normative reference in that document, does not clearly identify what profile of RTP is mandatory to implement. (Nor does the SDP specification referenced adequately describe which RTP profile(s) would be acceptable to pass to any API call that takes 'SDP' as a parameter)
Closing as "this is the IETF's problem". We have a normative dependency on rtcweb-transports, which references rtcweb-rtp.