It is a device capturing and controling all the signals, which are being created by the whole system, especially the made and received phone call signals. The device is mostly used for connecting regular phone system with the Internet and backwards.
ATCOM AT-530P IP phone allows making calls around the world without the use PSTN. It has two integrated 10/100 Mbps Ethernet ports and allow using this phone with the existing Internet connection. Atcom AT530P supports Static IP, DHCP-client and PPPoE.