Grandstream GS-GXP2170 VoIP Phone & Device 12 lines, 6 SIP accounts, 5 soft keys and 5-way voice conferencing 48 on-screen digitally customizable BLF/speed-dial keys 4.3 inch (480x272) color-screen LCD Dual Gigabit ports, integrated PoE Supports up to four GXP2200EXT Modules for BLF/speed-dial access to up to 160 contacts