SIP是当前IP电话的会话建立和信令控制的基础协议，SIP应用也是实现基于IP网络的语音等多种多媒体应用的基本途径。
SIP is currently the basic signaling and call setup protocol for IP telephony, and SIP applications are the basic way to provide voice and other multimedia services over IP.
会话发起协议(SIP)是IP网络应用层的控制协议，用于建立、修改和终止两个或多个参与者之间的会话。
The session Initiation protocol (SIP) is an application-layer control protocol for creating, modifying and terminating sessions among two or more parties.
网络借鉴了电路级代理工作的基本原理，以应用协议的会话数据流为对象，对信息系统进行控制和管理。
The concept adopted basic theory of circuit-level proxy. Taking session data flow of application protocols as its objective, VAN controlled and managed integrated information systems.
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