The GBX20 features a 272×480 LCD display that offers up to 40 contacts per module with support for up to 160 contacts by using 4 modules. The extension module 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. The GBX20 is an ideal sol ution for businesses and receptionists managing high call volumes, the GBX20 ensures maximum productiv ity by efficiently monitoring and dispatching incoming calls.