进行程控交换机数据库编程以及常规服务变更，以控制所有酒店内所有电话机的服务等级。

Performs PABX data-base programming and regular service change to control class of service on all telephone sets in the hotel.

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最后给出了安全IP电话网的设计，通过使用RADIUS认证系统实现用户认证和授权，通过使用IP保密电话机实现数据的安全传送。

In the end, the thesis gives the design of secure IP telephone system, which can authenticate and authorize through RADIUS, transfer data safely through the secrecy IP phone.

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配置在电缆两端的模块通过幻象电路配置内的两对导线为一个靠近数据设备的电话机与一个PBX之间的电话信号提供一个幻象通路。

Modules at each end of the cable provide a phantom path for telephony signals between a telephone near the data set and a PBX, through both conductor pairs in a phantom circuit arrangement.

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