The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol for creating, modifying and terminating sessions with one or more participants.
SIP是一种应用层控制信令协议，用于创建、修改和结束与一个或多个参与者的会话。
The session Initiation protocol (SIP) is an application-layer control protocol for creating, modifying and terminating sessions among two or more parties.
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。
To support the multimedia operation and supply the function such as call building and session control, the signal protocol is absolutely necessarily.
为了支持多媒体业务，提供呼叫建立、会话控制、接纳控制等功能的信令协议必不可少。
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