网络呼叫信令 NCS
基于网络的呼叫信令 Network-based Call Signaling
呼叫信令信道 call signalling channel
呼叫和信令处理模块 call & signaling process module ; CSPM
非呼叫相关信令 Non-Call Associated Signaling
融合网络呼叫控制信令 FCCS
网络融合呼叫控制信令 FCCS
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附件M包括虚拟专用网应用中支持专用网互联的附加基本呼叫信令要求。
Annex m contains the additional basic call signalling requirement for the support of private network interconnection for VPN applications.
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.
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.
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