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The real-time control protocol (RTCP) is  a sister protocol of the real-time transport protocol (RTP).  It provides feedback on the quality of the RTP session. A typical RTCP report is usually created after the call has ended. It will contain information such as the jitter, packet loss, codec, bytes transferred and recieved and possibly a MOS score on the overall call quality.

 

RTCP data is usually feed into a PMS system for correlation and monitoring call quality over time. From this data KPI's can be created to alert network management operators of poor voice quality.