You need to re-register the handset
at the base press and hold FIND HANDSET for approx 10 seconds until the in use/charger light on the base starts to flash. You are now in register mode and have 180 secs to register the handset.
at the handset press menu and then scroll to register and press ok
Enter the number of the base you want to register to (1-4) using the keypad. The handset begins to search for the base.
when the handset locates the base, you will be asked to enter the base PIN code (default 0000) and press OK
Registration is now complete and the handset goes into standby mode, displaying the newly allocated handset number
salako, March 2009