AUDIOLINE Pro 280 Bedienungsanleitung Seite 68

Setting the telephone
Resetting your phone
/
The phone book entries will not be deleted. Please delete the phone book
using the menu item "PHONE BOOK/DELETE ALL"
The registration of handsets will not be changed.
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Press the Menu softkey.
Select DEFAULT and press OK.
Enter the relevant PIN (default 0 0 0 0) and press OK.
Confirm the confirmation query with OK.