Grandstream GBX20 is an extension module that adds functionality, versatility, and flexibility to Grandstream’s GRP2615 and GRP2624 Carrier-Grade IP Phones and the GXV3350 IP Video Phone.
The Features of Grandstream GBX20 Extension Module
4.3 inch (272x480) TFT color LCD
20 per page (each module contains 2 pages, for up to 40 lines per module)
Combine up 4 daisy-chained modules for 160 contacts/extensions
BLF, call park /pick-up, speed-dial, presence, intercom, voice conferencing transfer/forward, and more