24.6423GPPCompletion of Communications to Busy Subscriber (CCBS) and Completion of Communications by No Reply (CCNR) using IP Multimedia (IM) Core Network (CN) subsystemProtocol specificationRelease 16TS
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 3GPP TS 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1".
 3GPP TS 24.229: "Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
 3GPP TS 24.628: "Common Basic Communication procedures using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification".
 3GPP TS 24.623: "Extensible Markup Language (XML) Configuration Access Protocol (XCAP) over the Ut interface for Manipulating Supplementary Services".
 RFC 6910 (April 2013): "Completion of Calls for the Session Initiation Protocol (SIP)".
 RFC 6665 (July 2012): "SIP-Specific Event Notification".
 3GPP TS 24.238: "Session Initiation Protocol (SIP) based user configuration".
 ITU-T Recommendation I.221 (1993): "Common specific characteristics of services".
 RFC 5875 (May 2010): "An Extensible Markup Language (XML) Configuration Access Protocol (XCAP) Diff Event Package ".
 IETF RFC 4825: "The Extensible Markup Language (XML) Configuration Access Protocol (XCAP)".
 IETF RFC 3023: "XML Media Types".
 IETF RFC 4483: "A Mechanism for Content Indirection in Session Initiation Protocol (SIP) Messages".
 IETF RFC 3261: "SIP: Session Initiation Protocol".