NEC DS1000 Feature Handbook page 62

Distinctive Ringing
2. Press
3. Enter the System Administrator (
Administrator 2 (
You see:
4. Enter the number of the default Ring Set (1-3) to which
you want to save your phone's configuration.
56
. You see:
ADMIN
9999
0000
), or Installer (
372000
), System
) password.