Distinctive Ringing
1.While your phone is idle, press PGM. You see:
2.Press RING. You see:
3.To change the ringing for your outside calls (Extension Override), press ASGN. You see:
4.Select the outside call ringing mode you want to change.
–Press DAY for day mode calls.
–Press NGT for night mode calls.
–Press DLY for delay ring calls.
You see (example shown if you select day ringing):
If you press MORE, you see:
–Select a ring type option (“A”, “B” or “C”), or
–Select LINE to have ringing follow the system default.
5.Press 
to hang up.
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