电话计费PB系统 自己做代码 系统智能检测对方摘挂机信号，采用反极、音检、延时等多种计费方式，计费准确、可靠 -电话计费系统智能检测对方摘挂机信号，采用反极、音检、延时等多种计费方式，计费准确、可靠

这是个挂机所代码 大家可以参考啊 看看用c++是如何编出来的-This is a hang up of the code can refer to ah you look at the use of c++ is how to come out for the