The firmware on keypad and base station must be compatible with the API used by PowerCom. As of January 2008, the firmware for the base station is V1.00, for the keypad it is V1.02, and for the WRS970.OCX it is V1.03, dated 11/28/2007. When you power on base station, the firmware version will be displayed on the LCD screen of the base. You can use keypad menu (Press Del and Base key at the same time) to check the keypad firmware version.