Sony SPP-M937 - Manual (Page 27)

27 US
Advanced Features
Advanced Features
Checking the ringer type
1
Press (PGM/SPEED DIAL).
2
Press (#).
3
Press (1) to check the ringer type of the line 1 or (2) to
check that of the line 2.
4
Press (0).
The currently selected ringer sounds.
5
Press (OFF).
Note
If you hear no sound (only key beep), the ringer on the handset has been turned
off.