Mitel 8528 Digital Display Phone (50006122, Black, Refurbished)Mitel 8528 Digital Display Phone (50006122) The Mitel 8528 Digital Phone (Part #50006122) is a reliable business class desk phone designed for Mitel digital communication systems. It features a 2 line display, programmable feature keys, and hands free speakerphone capability, making it ideal for office professionals and administrative users. The 8528 is part of the Mitel 5000 series and is commonly deployed in office environments, reception desks, and