虽然人们倾向于将传统的电路交换网络和新兴的ＩＰ网络作为两个互相独立的领域来看待。实际上它们互为补充并相互竞争，但市场急于将它们综合到全球通信网中，使两者的优势集中在一起。推动话音电路交换网络和数据网络融合的另一个因素是面向服务的网络的发展。所有网络的基本 Although people tend to treat traditional circuit-switched networks and emerging IP networks as two separate domains. In fact they complement each other and compete with each other, but the market is eager to consolidate them into a global communications network bringing together the strengths of both. Another factor driving the convergence of voice circuit switched networks and data networks is the development of service-oriented networks. The basic of all networks