新人求固话pos机原理

电话机（pos）和交换机之间是普通的pstn线路，电话机（pos）里集成了银行的电话银行中心（收单行）的电话号码（如95555），没有和它连接的交换机的字冠局向的问题，它是全局的特殊字冠。

拨号通了后，就是加密的银行通信问题了，电话只是提供了一个通信通路，pos功能是通过集成的加密模块完成和银行主机（银联主机）的交易通信

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