Grandstream GBX20 - key expansion module for VoIP phone

The Grandstream GBX20 Key Expansion Module adds functionality, versatility and flexibility to your carrier-grade IP phone and IP video phones. It features a 272 x 480 LCD display that offers up to 40 contacts per module with support for up to 160 contacts by using four modules. This 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. An ideal solution for businesses and receptionists managing high call volumes, the GBX20 ensures maximum productivity by efficiently monitoring and dispatching incoming calls. It is compatible with the Grandstream GXV3350 and GRP2615 phones.