An easy-to-setup extension module that is ideal for increasing call control efficiency for receptionists, executives or any high-volume user. Any attendant will enjoy maximized productivity by monitoring and dispatching multiple incoming calls with our Extension Modules. The GXP2200EXT pairs with our GXP2140, GXP2170, and GXV3240. The GBX20 extension module pairs with the GRP2615, GRP2624, GRP2650, GRP2670 IP phones as well as and GXV3350 and GXV3450 IP video phones.