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网络发展的原动力传统的以电路交换为核心技术的PSTN、PLMN为用户提供端到端的话音服务。数据通信技术的发展，给人们提供了新的业务平台，所有业务都通过单一的数据网传输正在逐步成为可能。利用数据网统一传送话音业务、数据业务、视频业务将给运营商带来革命性的转变。这种
The driving force behind the development of the network The traditional circuit-switched PSTN as the core technology, PLMN to provide users with end-to-end voice services. The development of data communication technology, to provide a new business platform for people, all services are transmitted through a single data network is gradually becoming possible. Uses the data network to transmit the voice service uniformly, the data service, the video service will bring the revolutionary change for the operator. This