A control protocol that helps organise RTP connections. (Note: despite "TCP" in its name, RTCP usually flows over UDP, similar to RTP). RTCP is defined in the same documents as RTP. SASL (Simple Authentication and Security Layer / RFC 2222) – a generic deswcription of how authentication and other security services can be added to other protocols (avoids each protocol having to define their own authrntication / security techniques).

RTCP provides support for real-time conferencing of groups of any size within an intranet. This support includes source identification and support for gateways like audio and video bridges as well as multicast-to-unicast translators. It offers quality-of-service feedback from receivers to the multicast group as well as support for the synchronization of different media streams.

real-time conferencing protocol