ITU-T - International Telecommunication Union/ITU Telcommunication Sector
Latest
ITU-T J.460.1-2008
Scope
This Recommendation specifies an implementation of common residential telephony features in an IPCablecom2 network with SIP based User Equipment (UEs). These features include the most commonly used residential features and capabilities@ including Caller ID features@ call forwarding features@ hold@ transfer@ three-way calling@ emergency calling@ and operator services. The IPCablecom2 network architecture uses the Session Initiation Protocol (SIP) as the basis for call setup and teardown. SIP was designed to permit distribution of feature logic to the network endpoints@ requiring less processing in network elements@ and theoretically permitting a reduction in cost of network infrastructure. Also@ SIP was designed to support a wide range of interactive applications@ including telephony@ video conferencing@ interactive messaging@ presence@ wireless services@ and many others. Lastly@ SIP is the foundation of the IP Multimedia Subsystem (IMS) architecture@ upon which the IPCablecom2 architecture is based. Many telecom equipment and software suppliers are focusing their investments in converged network solutions on the IMS architecture@ and the IPCablecom2 architecture leverages the IMS architecture@ which should yield more rapid implementation timeframes. This initial Residential SIP Telephony Feature Specification defines the Layer 3 and higher network requirements and signaling to enable User Equipment (UE) to establish services to emulate historical analog telephony services and features. This release of the Recommendation supports services described in Appendix II of [RST TR]. Future releases will support additional services that are described in Appendices I and III of [RST TR] as they are developed. It is an important objective of this work that interoperability between IPCablecom 2.0 and 3GPP IMS is provided. IPCablecom 2.0 is based upon 3GPP IMS@ but includes additional functionality necessary to meet the requirements of cable operators. Recognizing developing converged solutions for wireless@ wireline@ and cable@ it is expected that further development of IPCablecom 2.0 will continue to monitor and contribute to IMS developments in 3GPP@ with the aim of alignment of 3GPP IMS and IPCablecom 2.0. NOTE ?C The structure and content of this Recommendation have been organized for ease of use by those familiar with the original source material; as such@ the usual style of ITU-T recommendations has not been applied.