Grandstream GBX20 adds 40 programmable multi-purpose keys to Grandstream GRP2615 or GXV3350. Power users and receptionists will love the extra keys for BLF, speed dial, call park, presence, intercom, ..
This Grandstream GXP2000EXT expansion module features 56 programmable keys, offering options like busy line appearance, busy lamp field, conference, call transfer and pick up. The module lets you moni..
Grandstream GXP2200EXT Expansion Module connects to a Grandstream GXP2140, GXP2170, or GXV3240 phone, adding 20 dual-color programable buttons. Power users and executives will love the greatly increas..