Control layer: the Call Session control Function (CSCF), which is a general name that refers to SIP servers or proxies, is one of the core elements in the control layer.
控制层：呼叫会话控制功能(Call Session Control Function,CSCF)是指代sip服务器或代理的统称，是控制层中的核心组成部分之一。
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。
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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