NEC DS1000 - Manual (Page 88)

2. Press . You see:
3. To set up Key Ring Override, press . You see:
4. Select the type of key you want to program.
– The ring type you select in the next step will be
assigned to the key you press in this step.
– After you make your selection, the keys of the chosen
type will illuminate.
KEY
RING
80
Distinctive Ringing
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