Grandstream GXP2200EXT extension module Equip any desktop with superior call control, network visibility and in-call flexibility. The GXP2200EXT extension module provides greater network control for high-call volume users with its backlit LCD display, BLF and Speed Dial keys and additional contacts/extensions per module. Supported by the GXP2140, GXP2170 and GXV3240. Brand: Grandstream Model: Grandstream GXP2200EXT