(The construction of the computer office network of enterprises has begun to take shape, but the use of computer networks in most enterprises is limited to data communication. How to develop a variety of uses on this network, maximize the potential of office networks, and make the It is a very real problem that the investment brings more returns. The development of IP telephony services on this network is an important aspect of expanding the field of use. It can expand the use of LAN, not only limited to shared computers, printers and Internet access, but also includes telephone service.)
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