rtcp-mux stands for RTCP multiplexing.
This allows reducing the number of opened sockets and pinholes that need to be managed and reduces the resources required to get a session work through a firewall or NAT device.
While rtcp-mux is common in WebRTC, it is in less common use by other VoIP services and protocols that make use of RTP and RTCP.
See also BUNDLE.
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