Extension Modules – GXP2200 EXT Product Description GXP2200 EXT128×384 backlit LCD display 20 per page (each module contains 2 pages, for up to 40 lines per module) Connect 4 modules for up to 160 contacts/extensions See also different: Intercoms & PA – GSC3570, GS3574, GSC3575 Facility Access Systems – GDS3712 IP PBX Solutions – UCM RemoteConnect (UCMRC) GXP Series IP Phones – GXP2170