根据现有的来电显示(CID)技术规范，利用ARM7、FSK制式的来电显示解码芯片MT 88e39完成了主叫号码识别电路的设计和实现。
According to the specification of CID (calling identity delivery), the CID circuit is designed and realized by using ARM7 and FSK decoding chip MT88E39.
FPGA不仅要实现语音时隙交换的功能，还要与接口电路模块、号码分析模块、调度控制模块进行通信。
FPGA should not only implement the voice slot switch function, but also communicates with the interface module, caller-ID analyzing module and controlling module.
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.
纵横制交换由一个称为标志器的特定电路控制，标志器提供整个号码的公共控制并选择所有呼叫的路由。
Crossbar switching was carried out by a special circuit called a maker which provided common control of number entry and line selection for all calls.
纵横制交换由一个称为标志器的特定电路控制，标志器提供整个号码的公共控制并选择所有呼叫的路由。
Crossbar switching was carried out by a special circuit called a maker which provided common control of number entry and line selection for all calls.
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