The Mitel Superset 4025 is a multi-line full function set for office workers, professionals, managers and contact center agents. This phone can be for any user within the enterprise that requires information about calls they handle. Features 20 Character Digital Display Limited Automatic Call Distribution (ACD) Functionality Speed Calling Hold Transferring Calls Conference Calling Tilting Base Wall mountable 14 Personal Keys with Built in Status Indicators 10 Fixed Feature Keys Voice Mail Access (Message Waiting Lamp) 1-Year Warranty Compatibility SX200D, and SX2000 1-Year Warranty