文中介绍一种新型总线形式、双工通话的对讲系统，给出完整电路原理图及调试方法。
The paper introduces a new type of common line talk back system. Complete circuit diagram and an adjusting method are presented in this paper.
系统利用得到的来电号码，同存储的黑名单中的号码进行比较，判断是接通话机振铃线路，抑或控制模拟挂机电路挂机。
The system USES Caller ID, with the store's blacklist of Numbers, the judgement is connected to phone lines ringing, or simulated hang up control circuit hang up.
系统利用得到的来电号码，同存储的黑名单中的号码进行比较，判断是接通话机振铃线路，抑或控制模拟挂机电路挂机。
The system USES Caller ID, with the store's blacklist of Numbers, the judgement is connected to phone lines ringing, or simulated hang up control circuit hang up.
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