Gigaset Maxwell Expansion Module The key to additional functions Enhance your speed, functionality and reach with the Expansion Module from Gigaset pro. The Module features a large FSTN Display with two pages of 30 flexible buttons on the display. The device can handle 58 different features such as Busy Lamp Fields (BLF) and speed dial. All Gigaset IPphones are intuitive, attractive and reliable and the Expansion Module reflects that high quality. Gigaset pro‘s Expansion Modules are designed to support the user and the IP desktopphone for any business communication purpose.