In the IP telephone network which was constructed on IP network, the device or the system which offers the function of PLASTIC BONDED EXPLOSIVE connection controltothe extension and the external public network is done. There is a private hardware type which aimed for the replacement of former PLASTIC BONDED EXPLOSIVE and a software switch type which operates on the server. In addition it installs VoIP function in existing PLASTIC BONDED EXPLOSIVE, ???? PLASTIC BONDED EXPLOSIVE and IP-PBX exists together and there is also an available product.

If only IP network because communication with of the "ended two end" becomes principle original, the IP telephone terminal which exchanges the audio packet simply (the private machine or the software phone) connects the fellow, it cannot utilize function such as transfer. Those which actualize PLASTIC BONDED EXPLOSIVE such function was offered with the former telephone system with respect to IP network are IP-PBX.

The feature of IP-PBX is to be able to concentrate to be able to manage the extension of the base which leaves. As for former PLASTIC BONDED EXPLOSIVE it was necessary to install as a general rule in every base, if, but with IP-PBX between of base is connected with IP network, because it is management possible even by the extension of the base which leaves, it can unify operational conservative business such as modification of telephone number.

In addition because telephone communication to IP it means to be converted,CTI (computer-telephony integration)with without the technology which is called, the point that feature cooperation with the computer & the system becomes easy to do. Past compared to, affinityof computer application such as unified ??????? and voice mail increases.