As is known to all, the business activities of an enterprise largely depends on the modern methods of communication, telephone, fax, data exchange, the exchange of information, is the fundamental guarantee of enterprise survival and development, at the same time, the heavy use of these devices bring the burden, increase the management cost, especially the big international group, the big enterprise also pay a lot of money, in recent years, with the continuous development of communication technology, a new technology arises at the historic moment, it will very good voice technology and the integration of network transmission, enables both based on Internet, to transmit data, and can transmit voice and image, multi-purpose, full play to the role of the network, repeat investment, reduce the equipment reduced the cost, to reduce spending, this is VoIP technology,
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