Avaya 4624 108661273 D01 IP Phone (Black/Refurbished)Key Features: Mfr. Part #: 108661273 Compatible with IP Office Release 1. 0 or greater 24 Programmable Feature Buttons With LED 4 Display Navigation keys 4 Display Soft Keys Speaker, Mute, Hold, Volume Up & Down Fixed Keys Conference, Transfer, Redial Fixed Keys (Below the Display) 2 X 24 Character Display Message Waiting Indicator Full Duplex Speakerphone With Echo Cancellation 10 100 Base T Ethernet Connection Optional Integrated Ethernet Repeater