Ricoh C2828 Function Manual page 330

2. Connecting the Machine
Specifying the handset line type
2
The switch on the handset should be in the appropriate position-TT (Tone Dialing) or DP (Pulse Dialing).
Adjusting the handset bell volume
Adjust the handset ringer volume using the volume switch.
• Some external telephones may not be connected or may suffer reduced functionality.
112
TT DP
BHJ310S
Ringer
x
BHJ311S