switel DFT 877 Série Mode D'emploi page 174

Setting the telephone
Setting the dial mode
Menu
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In most situations the Tone option should be selected.
Setting the Flash Time
Menu
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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.
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Press the Menu softkey.
Select Base Settings and press Select.
Select Dial Mode and press Select.
Select Tone or Pulse and press Select.
Press the Menu softkey.
Select Base Settings and press Select.
Select Flash Time and press Select.
Select Short (100 ms), Medium (300 ms) or Long (600 ms)
and confirm with Ok.
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.