概述统一网络能够带来的简化企业运营以及向市场提供增强型新业务的能力的优势已经越来越为全球广大电信和Internet行业用户清楚地认识到。尽管业界为了实现这些优势已经做了很多工作，但是，将所有的网络流量从已经拥有一个世纪的悠久历史并且遍布全球的交换式公用电话网络（ Overview The advantages that a unified network can bring to simplify business operations and deliver new and enhanced services to the market are increasingly recognized by the vast majority of telecommunications and Internet industry users around the world. Although the industry has done a great job of realizing these advantages, it has moved all its network traffic from the world’s switched public switched telephone network, which has a century-old history