传统电路交换网和软交换网的区别，软交换的主要技术，软交换式电话网的演进方向，-The difference between traditional circuit-switched network and softswitch network, softswitch technology, the evolution of soft-switched telephone network direction,

关于软交换在电信网络中的发展，以及应用，含有软交换的发展，以及常用协议-On soft switching in the telecommunications network development and application of