The Real-time Transport Protocol (RTP) is used to deliver real-time
content and, along with the RTP Control Protocol (RTCP), forms the
control channel between the sender and receiver. However, RTP and RTCP
assume a single delivery path between the sender and receiver and make
decisions based on the measured characteristics of this single path.
Increasingly, endpoints are becoming multi-homed, which means that
they are connected via multiple Internet paths. Network utilization
can be improved when endpoints use multiple parallel paths for
communication. The resulting increase in reliability and throughput
can also enhance the user experience. This document extends the Real-
time Transport Protocol (RTP) so that a single session can take
advantage of the availability of multiple paths between two endpoints.