Display
Soft keys
Navigation key
Off-hook key
Key lock and
Upper/lower
Display Icons
Signal strength
Battery status
Microphone off
Loudspeaker on
Loudspeaker off
Sound off
Ring volume silent
Headset connected
System connection
Key lock
Phone lock
Avaya 3720 DECT Telephone - Quick Reference Guide
LED
Headset connector
Shows time and
Shows date and
Shows the soft key
function
On/Off and
On-hook key
Alphanumeric keys
Sound off key
Space
Microphone