3GPP TS 24.109: “Bootstrapping interface (Ub) and Network application function interface (Ua); Protocol details (Release 6)”
3GPP TS 24.141: “Presence service using the IP Multimedia (IM); Core Network (CN) subsystem; Stage 3 (Release 6)”
3GPP TS 24.147: “Conferencing using the IP Multimedia (IM) Core Network (CN) Subsystem; Stage 3 (Release 6)”
3GPP TS 24.228: “Signaling flows for the IMS call control based on SIP and SDP; Stage 3 (Release 6)”
3GPP TS 24.229: “IP Multimedia Call Control Protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 (Release 6)”
3GPP TS 24.147: “Conferencing using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3 (Release 6)”
3GPP TS 24.247 “Messaging using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3 (Release 6)”
3GPP TS 24.841: “Presence service based on Session Initiation Protocol (SIP); Functional models, information flows and protocol details (Release 6)”
3GPP TS 26.141: “IP Multimedia System (IMS) Messaging and Presence; Media formats and Codecs (Release 6)”
3GPP TS 24.109: “Bootstrapping interface (Ub) and network application function interface (Ua); Protocol details (Release 6)”
3GPP TS 29.328: “IP Multimedia Subsystem (IMS) Sh interface; Signalling flows and message contents”
3GPP TS 29.329: “Sh interface based on the Diameter protocol; Protocol details (Release 6)”
3GPP TS 33.222: “Generic Authentication Architecture (GAA); Access to network application functions using Hypertext Transfer Protocol over Transport Layer Security (HTTPS) (Release 6)”
draft-burger-sipping-netann-11: “Basic Network Media Services with SIP”
draft-ietf-simple-xcap-03 (July 2004): “The Extensible Markup Language (XML) Configuration Access Protocol (XCAP)”.
draft-ietf-simple-xcap-list-usage-02 (February 2004): “An Extensible Markup Language (XML) Format for Representing Resource Lists”.
draft-ietf-simple-xcap-package-03: “An Extensible Markup Language (XML) Document Format for Indicating Changes in XML Configuration Access Protocol (XCAP) Resources.”
draft-ietf-sip-connect-reuse-03.txt (April 2005): “Connection Reuse in the Session Initiation Protocol (SIP)”
draft-ietf-sip-content-indirect-mech-03 (June 2003): “A Mechanism for Content Indirection in Session Initiation Protocol (SIP) Messages”.
draft-ietf-sipping-cc-conferencing-01 (June 2003): “Session Initiation Protocol Call Control - Conferencing for User Agents”.