Avaya IP Phone 1600 Series 32 Button Module Key Features Product Description System Telephones Product Type Avaya – Expansion Module System Compatibility Compatible with Avaya IPO Headset port No Compatibility Avaya – IP 1616i Telephones Programmable Keys Provides 32 additional buttons with dual LEDs Display Yes Line cord N/A Features Up to 3 button modules can be connected to a single 1616 or 1616-I IP phone Manufacturer Part number 700415573 Power The units do not require their own power supply connection as they draw power from the phone to which they are connected.