The ITU-T Newslog has a post on work in ITUís Study Group 17 work on Relayed Multicast Protocol (RMCP), that uses a peer-to-peer type model. RMCP allows the live broadcast of video or audio piggy-backing off other users (or servers). So in a scenario where 100 people are demanding a live broadcast, instead of serving each one of these clients their own video stream, only one stream has to be provided and each user will be served from another in the network. This has significant implications for instance for businesses broadcasting live events, where a previous scenario demanded 100 users be fed individual feeds, RMCP allows the broadcast of just one.
ITU-T has published one Recommendation (ITU-T Rec. X.603) on the topic outlining requirements, framework etc. The next two Recommendations due in 2006 will focus on the technical specifications. One focusing on one broadcaster to many clients, and the other on many broadcasters to many clients.