The out-sorcing doing IP based network below, in data center outside, use. Especially communication system data center and the like, offers the function of the telephone switchboard with respect to IP networkbeing used "IP-PBX " as name of and technology is many.
Centrex, central (the center) with exchange (the switchboard) with the coined word which is combined, it points to the management of centralization of telephone service. Until recently, in the extension of the office it does not install & does not use every base of the branch office and the place of business etc.. This to IP with IP-PBX which is converted management of centralization of plural bases becomes possible.
Generally IP ??????? out-sorcing for the enterprise which is done is telephone service such as this managementequipment andbusiness the third party (common carrier). With IP ???????, because it becomes prerequisite, to connect between base with IP network, also telephone call between this branch office to IP comes to the point of converting, is connected to also the reduction of telephone call charge.
From around 2002 latter half, also the out-sorcing service by the and the like is started. In this case, the IP-PBX server is installed in data center of the trader, just to introduce the IP telephone into user enterprise side to be necessary, it is expected that management maintenance load of the extension can be reduced.
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