TTP, is not considered MIME-compliant because parsing and semantics are defined by the SIP stan- dard, not the MIME Specification [29]. Version 1.0 is the default value. An example is: MIME-Version: 1.0 References Rosenberg, J., et al., "SIP: Session Initiation Protocol," RFC 3261, 2002. [2] Fielding, R., et al., "Hypertext Transfer Protocol HTTP/1.1," RFC 2616, June 1999. Roach, A., "Session Initiation Protocol (SIP)-Specific Event Notification," RFC 3265, 2002. SIP Header Fields Rosenberg, J., H. Schulzrinne, and P. Kyzivat, "Caller Preferences and Callee Capabilities for the Session Initiation Protocol (SIP)," IETF Internet-Draft, Work in Progress, March 2003. [5] Johnston, A., and O. Levin, "Session Initiation Protocol (SIP) Call Control - Conferenc- ing for User Agents," IETF Internet-Draft, Work in Progress, April 2003. Rosenberg, J., and H. Schulzrinne, "A Session Initiation Protocol (SIP) Event Package for Conference State," IETF Internet-Draft, Work in Progress, June 2002. Braden, R., "Requirements for Internet Hosts: Application and Support," RFC 1123, 1989. [8] Mahy, R., and D. Petrie, "The Session Inititation Protocol (SIP) 'Join' Header," IETF Internet-Draft, Work in Progress, March 2003. [9] Willis, D., and B. Hoeneisen, "Session Initiation Protocol (SIP) Extension Header Field for Registering Non-Adjacent Contacts," RFC 3327, 2002. [10] Rosenberg, J., and H. Schulzrinne, "Reliability of Provisional Responses in Session Initia- tion Protocol (SIP)," RFC 3262, 2002. [11] Mahy, R., B. Biggs, and R. Dean, "The Session Initiation Protocol (SIP) 'Replaces' Header," IETF Internet-Draft, Work in Progress, March 2003. [12] Donovan, S., and J. Rosenberg, "Session Timers in the Session Initiation Protocol (SIP)," IETF Internet-Draft, Work in Progress, November 2002. [13] Postel, J., "Media Type Registration Procedure," RFC 1590, 1994. [14] Peterson, J., "A Privacy Mechanism for the Session Initiation Protocol (SIP)," RFC 3323, 2002. [15] Johnston, A., et al., "Session Initiation Protocol Private Extension for