http://www.rfc-editor.org/rfc/rfc4597.txt
RFC 4597: Conferencing Scenarios, R. Even, N. Ismail2006-08-01T23:00:00-00:00This document describes multimedia conferencing scenarios. It describes both basic and advanced conferencing scenarios involving voice, video, text, and interactive text sessions. These scenarios will help with the definition and evaluation of the protocols being developed in the centralized conferencing XCON working group. This memo provides information for the Internet community.