RTCP - technical definition

In the TCP/IP protocol suite, a companion protocol to the Real Time Transport Protocol (RTTP), RTCP allows monitoring of the data delivery in a manner scalable to large multicast networks, and provides minimal control and identification functionality. RTCP and RTP both are defined in IETF RFC 1889 (1996). See also IETF, multicast, protocol, protocol suite, RTP, and TCP/IP.