RTCP in IMS network

RTCP referes to "Real-Time Control Protocol". And it is a companion protocol to RTP prototcol.

RTCP provides feedback to different nodes in the RTP session, about the quality of the data stream between them. It reports parameters, such as packet loss, delay, and jitter.

RTCP reports can be used to provide feedback about congestion in the network, allowing the RTP senders to adapt their transmission rates accordingly.

Those reports can also be used by service providers, to monitor and ensure the quality of the audio/video streams, enabling service providers to provide a satisfactory user experience.