Display
Soft keys
Navigation key
Off-hook key
Voice mail
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 (PDM or AIWS)
Key lock
Phone lock
Avaya 3720 DECT Telephone - Quick Reference Guide
LED
Headset connector
Shows time and
icons
Shows date and
icons
Shows the soft key
function
On/Off and
On-hook key
Alphanumeric keys
Sound off key
Space
Microphone