The GXP2200EXT extension module is supported by the GXP2140, GXV3240 and GXP2200.
The module includes 20 dual-colored extension keys and 2 arrow keys for page switching (allowing each GXP2200EXT to support up to 40 contacts/extensions. Grandstream GXP2200EXT Expansion Module - LCD By using the GXP2200EXT the telephone attendant can maximize productivity by efficiently monitoring and dispatching multiple incoming calls..This expansion module supports traditional call features on each of its programmable buttons, including 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.