The following publications are possibly variants of this publication:
- SIP: Session Initiation ProtocolJonathan D. Rosenberg, Henning Schulzrinne, Gonzalo Camarillo, Alan B. Johnston, Jon Peterson, Robert Sparks, Mark Handley, Eve M. Schooler. rfc, 3261:1-269, June 2002. [doi]
- Using E.164 numbers with the Session Initiation Protocol (SIP)Jon Peterson, Hong Liu, James Yu, Ben Campbell. rfc, 3824:1-16, June 2004. [doi]