Turn audio signals on/off
In idle mode a long press on the Sound off key changes
between audio signals on/off. The Sound off icon 
indicates a completely silenced telephone.
•A short press on the Sound off key before answering a call, silences the ring signal.
Lock/Unlock the keypad manually
Press the 
Yes. The Locked keypad icon 
indicates a locked keypad.
Change the volume during a call
Press the Volume button upwards to increase the volume, downwards to decrease the volume. Or, use the Navigation key to adjust the volume.
Charge the battery
Charging is done in a desktop charger or in a charging rack. Charging is indicated by orange LED. When the battery is fully charged the LED is green and a fully charged Battery
icon 
is displayed.
While in a desktop charger the telephone is fully operational. The telephone does not vibrate in charger.
The battery can also be charged in a separate battery pack charger.
Note: Charging below 5°C will harm the battery and shorten the lifetime.
Remove the battery
It is recommended to switch off the telephone before removing the battery.
Messaging
Receive a text message
When a text message is received, the LED starts flashing and a message tone sounds. A
Avaya 3725 DECT Telephone - Quick Reference Guide
