Avaya BM32 32 Button Expansion Module, add-on module, Avaya 700415573, expansion module for the Avaya 1616 IP Phone.  Avaya BM32 Expansion Module Features: Provides 32 additional buttons with dual LEDs;
Up to 2 button modules can be connected to a single 1616 IP phone;
Compatible with IP Office R4.2 or higher and Avaya Communication Manager R3.0 or higher; Part Number: 700415573.