You can connect the optional handset or an external telephone to the machine.
You can use it for telephone calls.
When you use the optional handset or an external telephone with the [On Hook Dial] key for telephone calls, you can not talk with the other party without pressing the [On Hook Dial] key after talking off the receiver.
Specifying the handset line type
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.
Adjusting the handset receiver volume
Adjusting the handset receiver volume using the volume switch.
Some external telephones may not be connected or may suffer reduced functionality.