HD voice. Dual Gigabit Ethernet port. 4.3" backlit color screen. Built-in USB port. Supports Bluetooth headset. 6 SIP accounts. PoE support EHS support. Expansion modules available. Adjustable support Mountable on the wall. Hold, mute, DND, call forwarding, call waiting, call forwarding. LED indicator of call. Caller ID with name, number and photo. 10 line LED keys. 27 programmable functions. Headphone port RJ9. RJ12 port Ext. Power through Ethernet.