Gatekeeper constitutes a very important part in IP phone system.
网守是IP电话系统中重要的组成部分。
The result shows that it is very suitable to make a application of IP phone system in expressway.
结果表明，在高速公路上实施IP电话系统是完全适宜的。
This paper introduces the design of IP Phone terminal using SIP (Session Initiation Protocol) upon the OMAP5912 platform of a vehicle electronic multi-media video and audio system.
以车载汽车电子多媒体视听系统为研发背景，在OMAP5912平台上采用SIP(会话发起协议)设计了IP电话终端。
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