NEC SV8100 Quick Reference Manual page 5

Press BEGIN (in the Display to connect the callers)
ADJUST RINGING VOLUME
Press SPEAKER Dial *729
Adjust volume using volume up/down keys at bottom of phone
Press SPEAKER to save
CHANGE RING TONE
Press SPEAKER
Dial *720
Press 1 for Internal Calls or 2 for outside Calls
Press 1-8 to choose tone
Press SPEAKER to save
CALLER ID SCROLL
Press LIST softkey in display
Press CID softkey in display
Press arrow softkeys in display to view calls
SYSTEM SPEED DIAL
(Using softkeys Under Display)
Press DIR
Press SPD
Use arrow keys to scroll thru speed dials
Lift handset to dial