 most other networks. References Information about the 3GPP project, including the latest technical specifications (TS), can be found at http://www.3gpp.org. Schulzrinne, H., and E. Wedlund, "Application-Layer Mobility Using SIP," Mobility Mobile Computing and Communications Review (MC2R), Vol. 4, No. 3, July 2000. Perkins, C., "IP Mobility Support," RFC 2002, 1996. Vakil, F., et al., "Supporting Mobility for Multimedia with SIP," IETF Internet-Draft, Work in Progress, December 2000. Schulzrinne, H., "Dynamic Host Configuration Protocol (DHCP-for-IPv4) Option for Session Initiation Protocol (SIP) Servers," RFC 3361, 2002. Duric, A., and S. Anderson, "RTP Payload Format for iLBC Speech," IETF Internet- Draft, Work in Progress, March 2003. 3GPP TS relating to SIP include TS 23.228 and TS 24.229. For the latest on these and other SIP-related specifications, visit http://www.3gpp.org. Wireless and 3GPP [8] Donovan, S., and J. Rosenberg, "Session Timers in the Session Initiation Protocol (SIP)," IETF Internet-Draft, Work in Progress, November 2002. Olson, S., G. Camarillo, and A. Roach, "Support for IPv6 in Session Description Protocol (SDP)," RFC 3266, 2002. [10] Price, R., et al., "Signaling Compression (SigComp)," RFC 3320, 2003. Camarillo, G., "Compressing the Session Initiation Protocol (SIP)," RFC 3486, February 2003. Sjoberg, J., et al., "Real-Time Transport Protocol Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs," RFC 3267, June 2002. Willis, D., and B. Hoeneisen, "Session Initiation Protocol Extension Header Field for Service Route Discovery During Registration," IETF Internet-Draft, Work in Progress, February 2003. Willis, D., and B. Hoeneisen, "Session Initiation Protocol (SIP) Extension Header Field for Registering Non-Adjacent Contacts," RFC 3327, 2003. Garcia-Martin, M., E. Henrikson, and D. Mills, "Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3rd-Generation Partnership Project (3GPP)