Registering a DECT 413 handset is only necessary if handset displays UNREGISTERED and if the icon for base/handset link on the right side is blinking. You will need the PIN code (0000 by default). 1. Press the soft key to select REG. and then OK for Registering. 2. Press and hold the paging key on the base station during 4 seconds and enter PIN code. 3. Select OK.