现有的电信网络主要是由传统的 TDM技术构建的．随着时间的推移．其建设成本高、设备利用率低、新业务开发速度慢、可开发业务种类少．维护成本高等问题暴露得越来越多．已经明显呈现老化态势。客观上．需要新一代电信网络取代传统的电信网．来满足人们不断增长的生产生活的通信需求．如在固定网络中采用软交换技术替代传统的PSTN技术构建下一代网络即NGN。与此同时．在移动核心网中．移动软交换的概念和设备也正在逐步被引入。而这些新技术都是基于IP技术的．可以说．传统 TDM电信网的演进方向是向全IP网络演进,这早已是业界共识。需要特别指出的是．在某种意义上．采用IP 技术的软交换技术是传统固定网络和移动网络向全IP通信网演进的初级阶 The existing telecommunications network is mainly built by traditional TDM technology. Over time. Its high cost of construction, equipment utilization is low, new business development is slow, can develop a small number of types of business. Higher maintenance costs are exposed more and more. It is obvious that the aging situation. Objectively Need a new generation of telecommunications networks to replace the traditional telecommunications network. To meet people’s growing communication needs of production and life. As in the fixed network using softswitch technology to replace the traditional PSTN technology to build NGN next-generation network. at the same time. In the mobile core network. Mobile softswitch concepts and equipment are also gradually being introduced. These new technologies are based on IP technology. It can be said. The evolution of traditional TDM telecom networks is towards an all-IP network, which has long been the consensus of the industry. Need to point out is. In a sense Softswitch technology using IP technology is the primary order of evolution from traditional fixed networks and mobile networks to all-IP communication networks