© 2009 by Taylor & Francis Group, LLC Group Conference Management with SIP [16] Ben Campbell, Rohan Mahy, and Cullen Jennings (Eds.). 2007. The Message Session Relay Protocol (MSRP). RFC 4975, IETF, September. [17] Rohan Mahy, Robert Sparks, Jonathan Rosenberg, Dan Petrie, and Alan Johnston. 2007. A call control and multi-party framwork for the session initiation protocol (SIP). Internet draft-work in progress 9, IETF, November. [18] Henning Schulzrinne, Stephen Casner, Ron Frederick, and Van Jacob- son. 2003. RTP: A Transport Protocol for Real-Time Applications. RFC 3550, IETF, July. [19] Jonathan Rosenberg. 2007. Obtaining and using globally routable User Agent (UA) URIs (GRUU) in the Session Initiation Protocol (SIP). Internet draft-work in progress 15, IETF, October. [20] Jonathan Rosenberg, Jon Peterson, Henning Schulzrinne, and Gonzalo Camarillo. 2005. Best current practices for third party call control (3pcc) in the Session Initiation Protocol (SIP). RFC 3725, IETF, April. [21] Alan Johnston, and Orit Levin. Session Initiation Protocol (SIP) Call Control-Conferencing for user agents. 2006. RFC 4579, IETF, August. [22] Rohan Mahy, and Dan Petrie. 2004. The Session Initiation Protocol (SIP) "Join" Header. RFC 3911, IETF, October. [23] Jonathan Rosenberg, Henning Schulzrinne, and Rohan Mahy. 2005. An INVITE-Initiated Dialog Event Package for the Session Initiation Protocol (SIP). RFC 4235, IETF, November. [24] Robert Sparks. 2003. The Session Initiation Protocol (SIP) refer method. RFC 3515, IETF, April. [25] Gonzalo Camarillo, and Alan Johnston. 2007. Conference establishment using request-contained lists in the Session Initiation Protocol (SIP). Internet draft-work in progress 01, IETF, November. [26] Jonathan Rosenberg, Henning Schulzrinne, and Orit Levin. 2006. A Session Initiation Protocol (SIP) Event Package for Conference State. RFC 4575, IETF, August. [27] Stephen E. Deering. 1989. Host extensions for IP Multicasting. RFC 1112, IETF, August. [28] Supratik Bhattacharyya. 2003. An overview of Source-Spe