With the increased popularity of real-time multimedia applications,
it is desirable to provide good control of resource usage, and users
also demand more control over communication sessions. This document
describes how a receiver in a multimedia conversation can pause and
resume incoming data from a sender by sending real-time feedback
messages when using Real-time Transport Protocol (RTP) for real time
data transport. This document extends the Codec Control Messages
(CCM) RTCP feedback package by explicitly allowing and describing
specific use of existing CCM messages and adding a group of new real-
time feedback messages used to pause and resume RTP data streams.
This document updates RFC 5104.