IP电话网关主要功能为连接传统电话网与IP网络，完成多路呼叫的信令协议和语音格式的转换。

The main function of gateways is to connect IP network and traditional phone system, and provide multi-call signaling exchanging and the conversion of voice formats.

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本论文采用的是M3UA协议实现S100信令网关的信令互通功能。

M3UA protocol is adopted to complete interworking function of S100 signaling gateway in the paper.

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七号信令网关是软交换体系结构中的重要功能实体。

No. 7 signaling gateway is an important functional entity of soft switch system structure.

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