标准编号：ISO/IEC TR 22767:2005
中文名称：信息技术 系统间电传视讯和数据交换 SIP电话用户代理商（uaCSTA） 用CSTA
英文名称：Information technology — Telecommunications and information exchange between systems — Using CSTA for SIP phone user agents (uaCSTA)
发布日期：2005-08
标准范围
The Session Initiation Protocol (SIP) is a control (signalling) protocol for creating, modifying, and terminatingsessions with one or more participants. These sessions include Internet telephone calls, multimediadistribution, and multimedia conferences.CSTA standardizes a very powerful and flexible set of application services to observe and control voice andnon-voice media calls as well as control and observe non-call related features.This Technical Report describes how CSTA can be used to provide a subset of CSTA call control functionality,called 1st party call control, for SIP user agents. The term uaCSTA (for user agent CSTA) refers totransporting ECMA-323 (CSTA XML) messages over a SIP session.uaCSTA leverages SIP mechanisms to provide a highly featured, robust, and extensible set of features tosupport applications in the Enterprise environment.uaCSTA can be implemented by several different types of SIP user agents:? directly by a SIP user agent on a SIP phone? uaCSTA can also be implemented by a SIP B2BUA to augment 3PCC functionality? by a proxy server that is front-ending a PBX.
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