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近几年来，电信技术的飞速发展使网络运营商面临许多挑战。其中重要的挑战是迅速增长的数据业务所需要的大带宽和现有网络支持ＩＰ业务的解决方案。然而，让所有的业务提供商都仅把注意力放在ＩＰ业务的发展上显然是不可行的，因为话音收入仍然是主要的业务来源，这种情况还将
In recent years, the rapid development of telecommunication technology has brought many challenges to network operators. One of the key challenges is the large bandwidth needed for rapidly growing data services and solutions for supporting IP services in existing networks. However, it is clearly not feasible for all service providers to focus solely on the development of IP services, as voice revenue remains the main source of business, which will