http://www.rfc-editor.org/rfc/rfc5366.txt
RFC 5366: Conference Establishment Using Request-Contained Lists in the Session Initiation Protocol (SIP), G. Camarillo, A. Johnston2008-10-01T23:00:00-00:00This document describes how to create a conference using SIP URI-list services. In particular, it describes a mechanism that allows a User Agent Client to provide a conference server with the initial list of participants using an INVITE-contained URI list. [STANDARDS-TRACK]