Model: 5410D MPN: 700382005 The Avaya 5410 digital telephone is a model designed for users that need a phone on their desk as part of their everyday job. Features: 5 line x 29 character display (168 x 80 pixel, 4-grayscale) 11 Fixed Feature Buttons 12 Programmable Feature Buttons Message Waiting Indicator Two-way hands-free speaker and microphone Desk or Wall Mountable Integrated Headset Socket, 8 Personalized Ring Patterns, Hearing Aid Compatible Compatibility: The Avaya 5410 digital telephone is compatible with Avaya IP Office 3.0 or higher Requires an available digital station port IP Office R7.0 – IP500 control unit must be running full IP Office mode. Not compatible in Quick mode. IP Office R8.0 or higher – IP500 control unit must be running Essential Edition. Not compatible in Basic Edition.