This paper introduces the VoIP (Voice over Internet Protocol), also known as IP telephony or IP network telephone, can be said to be an application of the Internet, it has to do with E-mail, instant messaging, search the web, is a kind of network applications, VoIP has been widely used in the first place in the enterprise, it is greatly reduced the charge for the enterprise cost, these companies usually have perfect Ethernet connection, some already has a special data network, they can be easily through the existing network VoIP business,
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