SIP 与NGN网络具有的良好契合性，使其成为NGN 网络中最为重要的会话控制协议。
SIP is naturally in harmony with NGN and it is one of the most important session control protocols in NGN network.
当3GPP开始需求在他们的网络中实现IP的方法时，他们发方法开始需求觉首先要对呼叫和会话控制中单一共有的协议进行标准化标准化进行会话。
As the 3GPP began looking at ways to implement IP in their networks, they found a need to standardize first of all on one implement standard network common protocol for call and session control.
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 (signaling) protocol for creating, modifying and terminating sessions with one or more participants.
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