switel DF 911 Mode D'emploi page 172

Setting the telephone
Editing the PIN
Menu
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The four digit PIN protects some settings against unauthorized changes.
If you have forgotten your PIN please call our service hotline.
Resetting the base station
Menu
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The entries in phonebook will not be deleted.
The registration of handsets will not be changed.
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Press the Menu softkey.
Select Base Settings and press Select.
Select Modify PIN and press Select.
Enter the relevant PIN (default 0 0 0 0) and press OK.
Enter a new PIN and press OK.
Enter the new PIN again and press OK.
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.