The Avaya 9641G IP Telephone features a 4.1 x 2.3 inch color touchscreen display, configurable line and feature buttons, and wideband audio and speakerphone. It supports Bluetooth and DECT headsets with an optional adapter, USB application support, and up to three additional button modules. The phone is compatible with Avaya Communication Manager versions 3.1.4 or higher in H.323 mode or 6.0 with Session Manager in SIP mode, and also works with IP Office 6.1 or higher on certain control units.