路由选择号码以自身了解的方式遵循外部网络的信令协议。
The routing number follows the signalling protocol of the external network.
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。
To support the multimedia operation and supply the function such as call building and session control, the signal protocol is absolutely necessarily.
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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