下面，我们将首先回顾传统PSTN网络上的话音传递，然后介绍VoIP的基本概念和VoIP中的重要协议MGCP/SIP。 图1给出了传统电话网络PSTN的组织结构图。
also known as SIP trunking in the VoIP channel. While earlier versions of Response Point allowed only analog lines to be connected to the PSTN, small businesses will be able to connect to the PSTN ...
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