With the deepening of the Internet application and development of various new technologies emerge in endlessly, ISP and ICP, ASP network company constantly emerging, such as driving the data business continued rapid growth, is expected to achieve in recent years and more than voice business, IP will become the dominant technology of the future information and communication, all kinds of business can be hosted by IP packet (Everything over IP), and IP traffic can be transmitted in a variety of transmission media (IP over Everything), and based on IP network, finally realizes the data, voice, image fusion of business and network integration, the unified technical solutions to build a new generation of information network, to provide voice, data and images and other integrated services, will become the goal, this paper will detail technology of VOIP
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