Avaya one-X Deskphone SBM24 Button Add-on Module

* Adds 24 Line/Feature Appearance Buttons * Phone not included * Compatible with Avaya 9630, 9630G, 9640, 9640G, 9650, an 9650C IP telephones; IP Office R6.0 or higher - Can add up to 3 SBM24 modules per phone; up to 42 SBM24s per system; Avaya Communication Manager R4.0 or higher - Can add up to 3 SBM24 modules per phone; Avaya Communication Manager below R4.0 - Support for one SBM24 per phone