Beijing institute of navigation telson network communication technology to satisfy the need for government agencies at all levels, launched VOIP phone network system solutions, in offices at all levels of data network nodes are installed on the VOIP equipment, and through the analog/digital E1 relay interface connected to the local original office phone environment, realize the internal agency office phone via IP data network communication, at the same time institutions outside of the long distance telephone also can use IP telephone network transmission, through called cities and voice over IP gateway through PSTN local option, which does not produce any cost of long-distance communication, in the center of the network organization to establish a set of IP telephone network management, call statistics system, IP voice gateway in the IP network call identity authentication; Unification of entire network number distribution, network equipment, call statistics,
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