标准摘要
[中文适用范围]： 会话发起协议 (SIP) 是一种控制（信令）协议，用于创建、修改和终止与一个或多个参与者的会话。 这些会话包括互联网电话呼叫、多媒体分发和多媒体会议。 CSTA 标准化了一组非常强大且灵活的应用程序服务，以观察和控制语音和非语音媒体呼叫以及控制和观察非呼叫相关功能。 本技术报告描述了如何使用 CSTA 为 SIP 用户代理提供 CSTA 呼叫控制功能的子集（称为第一方呼叫控制）。 术语 uaCSTA（用户代理 CSTA）是指通过 SIP 会话传输 ECMA-323 (CSTA XML) 消息。 uaCSTA 利用 SIP 机制提供一组功能丰富、强大且可扩展的功能来支持企业环境中的应用程序。 uaCSTA 可以通过多种不同类型的 SIP 用户代理来实现： •直接通过 SIP 电话上的 SIP 用户代理来实现 • uaCSTA 也可以通过 SIP B2BUA 来实现，以增强 3PCC 功能 • 通过作为 PBX 前端的代理服务器。 [外文原描述]： ISO/IEC TR 22767:2005 describes how CSTA can be used to provide a subset of CSTA call control functionality, called first party call control, for Session Initiation Protocol (SIP) user agents. The term uaCSTA (for user agent CSTA) refers to transporting ECMA-323 (CSTA XML) messages over a SIP session. SIP is a control (signalling) protocol for creating, modifying, and terminating sessions with one or more participants. These sessions include Internet telephone calls, multimedia distribution, and multimedia conferences. CSTA standardizes a very powerful and flexible set of application services to observe and control voice and non-voice media calls as well as control and observe non-call related features. uaCSTA leverages SIP mechanisms to provide a highly featured, robust, and extensible set of features to support 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, andby a proxy server that is front-ending a PBX.
英文名称Information technology - Telecommunications and information exchange between systems - Using CSTA for SIP phone user agents (uaCSTA)