Avaya Definity 6416D+M Speaker Display Phone (Grey/Refurbished)The Avaya Definity 6416D+M Speaker Display Phone is a speaker display phone that works with Definity Phone systems Release 6. 1 or higher. This phone needs a TN2181 digital circuit card or TN2224B digital circuit card. Key Features: 24 Character LCD Caller ID Date and Time 16 Programmable Call Appearance Speakerphone 8 Personal Ring Options 4 Navigator Keys for Menu Integrated Headset Jack Mute Conference Transfer Hold Speaker Last Number Dialed