5.2. CNAME Use
In both the session-multiplexing and the SSRC-multiplexing cases, a sender MUST use the same RTCP CNAME [3] for an original stream and its associated retransmission stream.
In both the session-multiplexing and the SSRC-multiplexing cases, a sender MUST use the same RTCP CNAME [3] for an original stream and its associated retransmission stream.