NEC DS1000 Feature Handbook page 26

Distinctive Ringing
7. When you see:
– Dial (for yes) or confirm your selection, or
9
– Dial 6 (for no) to exit without making a selection.
8. Press to exit.
To select a new default Ring Tone Set for your super dis-
play telephone:
1. While your phone is idle, press
22
. You see:
PROGRAM