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.
GXP2124 is an enterprise class IP-phone, which is equipped with 240x120 graphic LCD display with a backlight, 4 line keys supporting up to 4 SIP accounts, four special programmable context-sensitive (in the language XML) buttons, 24 +4 programmable XML-speed dial buttons, dual network ports with integrated PoE, five-party conferencing and Electronic Hook-Switch (EHS).