GXP2200EXT Master Set Expansion Module

Grandstream GXP2200EXT Expansion Module for the Master IP Phone.
128×384 backlit LCD display, 20 programmable dual-color buttons per module, 2 pages per module (40 contacts total), BLF/speed dial, Daisy-chain up to 4 modules for up to 160 contacts/extensions, BLA (bridged line appearance)/SCA (shared call appearance), BLF (busy lamp field, standard or eventlist), Call Park/Pick-up, Speed Dial, Presence, Intercom, and conference/ transfer/forward and more.