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3.1.5.38 Support for multiplexing RTP and RTCP ports with ICE

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A user agent SHOULD<66> support negotiation of multiplexed RTP and RTCP ports as described in [RFC5761] using the a=rtcp-mux media attribute in SDP offers and SDP answers.

A media stream which negotiates RTP/RTCP multiplexing MUST support ICE as specified in [IETFDRAFT-ICENAT-19]. If RTP/RTCP multiplexing is negotiated for a media stream, the a=remote-candidates attribute MUST include both RTP and RTCP components.