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The GBX20 is an Extension Module that adds functionality, versatility and flexibility to the GRP2615, GRP2624, GRP2650, GRP2670 carrier-grade IP phones as well as and GXV3350 and GXV3450 IP video phones. It features a 272x480 LCD display that offers up to 40 contacts per module with support for up to 160 contact s by using 4 modules. The GBX20 supports a wide-range of advanced call features including BLF, call park /pick-up, speed-dial, presence, intercom, voice conferencing transfer/forward and much more. An ideal solution for businesses and receptionists managing high call volumes, the GBX20 ensures maximum productivity by efficiently monitoring and dispatching incoming calls.