Multifunction button
Volume buttons
Display
Sound off key
Soft keys
Confirmation button
Voice mail
Key lock and
Upper/lower case
LED
Headset connector 
Shows time and icons
Shows date and icons
Shows the soft key function
On/Off,
Alphanumeric keys
Sound off button
Space
Microphone
Display Icons
Signal strength Battery status Voice mail Microphone off
Ring volume set to silent Loudspeaker on Loudspeaker off Sound off
Headset connected Bluetooth headset connected Bluetooth
New message Read message Missed call
Incoming call Outgoing call System connection Key lock
Phone lock
Avaya 3725 DECT Telephone - Quick Reference Guide