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RTP Control Protocol (RTCP) is a real time transport protocol (RTP) component of voice over Internet protocol (VoIP) communication.
RTCP’s basic operation and packet structure are specified by RFC 3550.
RTCP features are:
RTCP’s primary function is delivering quality of service (QoS) feedback for media distribution through recurrent statistical data transmission to streaming multimedia contributors. This includes exchanged octet, packet counts, lost packet counts, jitters and round-trip delays. However, RTCP does not exchange media streams.