The preset PIN is 0000. It is required for pairing or un-pairing handsets. Press the Menu/OK button to confirm the PIN. If you need to make corrections, press REDIAL/C or Clear or Back.
Pairing (or registration) would be completed. The base automatically assigns a handset number to the handset.
Note: If the handset and base stations are not the same model, some features, such as phonebook, may not be supported.