This study intends to investigate the architectural impacts on and potential enhancements to IMS specifications to meet the normative requirements for CAT in IMS domain as specified in TS 22.182
Architecture and procedures to support basic call scenarios for CAT in IMS domain;
Interaction with other service, e.g. IMS Multimedia telephony supplementary services;
Service provision for roaming subscribers;
Interworking between IMS CAT and CS CAT in TR 29.882.
In the end, this study will provide conclusions with respects to what further specification work is required in order to fulfil the requirements for the CAT in IMS domain.
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
: "Vocabulary for 3GPP Specifications".
: "Customized Alerting Tones (CAT) Requirements".
: "IP Multimedia Subsystem (IMS); Stage 2".
: "Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
"The Early Session Disposition Type for the Session Initiation Protocol (SIP)".
" Early Media and Ringing Tone Generation in the Session Initiation Protocol (SIP)".
: "IP Multimedia (IM) session handling; IM call model; Stage 2".
" Hypertext Transfer Protocol -- HTTP/1.1".
" Reliability of Provisional Responses in Session Initiation Protocol (SIP)".
: "Transparent end-to-end Packet-switched Streaming Service (PSS) ".
3GPP2 X.S0055: "MMD Supplementary Services ".
"RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals".
"Caller Preferences for the Session Initiation Protocol (SIP)".
"A Mechanism for Content Indirection in Session Initiation Protocol (SIP) Messages".
: "Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks".
For the purposes of the present document, the terms and definitions given in TR 21.905
apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905
For the purposes of the present document, the abbreviations given in TR 21.905
apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905