Grandstream GBX20 LCD Extension Module
GBX20 expansion module (sidecar / attendant console), 4.3 inch colour TFT LCD, 40 keys (2 pages of 20 keys),
for GXP2615 and GXV3350 (add up to 4 x expansion modules (sidecar / attendant console). A single GBX20 can be powered by the GRP2615 or GXV3580. When 2 or more GBX20 are connected
