It is a call which is made over internet protocol (VoIP). For example,
one can call using Google Voice to other recipient located miles away. Such
call can also be international.
GXP2120 is an IP Phone of a new generation. It has six lines, a large LCD screen with a 320x160 resolution, 4 programmable context-sensitive soft keys (XML), 7 programmable speed dial keys with BLF support, two network PoE ports and probability of five-sided conference.