switel DF 87 Série Mode D'emploi page 157

Resetting the base station
Menu
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The entries in phonebook, call list and redial list will not be deleted.
The registration of handsets will not be changed.
Press the Menu softkey.
Select Base Settings and press Select.
Select BS Default and press Select.
Enter the relevant PIN (default 0 0 0 0) and press Ok.
Confirm the confirmation query with Ok.
Setting the telephone
GB
29