Avaya BM12 Features Provides 24 additional buttons using two pages of 12 call appearances/features each Buttons can be used for additional lines for incoming calls, outgoing calls, and calling features Compatibility The Avaya BM12 is compatible with the Avaya 9608, 9611G, and 9641G IP phones Also compatible with the Avaya 9408 and 9508 digital phones; when adding the BM12 to the Avaya 9408 or 9508, an 1151C1 power is required (sold separately; see drop down option above) Can add up to three button modules per phone