会话初始化协议(SIP)是IETF提出的IP电话呼叫信令协议，是一个基于文本的协议，用来创建、修改和终止多媒体呼叫与会话。
SIP is proposed by IETF as IP phone call order protocol which is totally a text modality that to be used to establish, modify and terminate multimedia calls and conversation.
会话启动协议是由IETF提出的一个应用层的信令控制协议，用来创建、修改和终止一个或多个参加者参加的会话进程。
The session Initiation protocol (SIP) is an application-layer control (signaling) protocol distributed by IETF for creating, modifying and terminating sessions with one or more participants.
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