Mitel 5312 IPMitel 5312IP 2 line by 20 character white backlit graphics display with contrast control and auto dimming 12 programmable multi function keys with dual color LED indicators (for speed dialing, line appearances, feature access) 8 function keys: hold, menu, message, speaker, mute, transfer conference, redial, cancel Browser based desktop user tool programming for easy access to telephone system features Handsfree speakerphone operation (full duplex)