Yealink SIP-T21 E2 User Manual page 13

Overview
Icons appearing on the LCD screen are described in the following table:
Icon Description
Network is unavailable
The private line registers successfully
Register failed
Registering
The shared/bridged line registers
successfully
Hands-free speakerphone mode
Handset mode
Headset mode
Voice Mail
Text Message
Auto Answer
Do Not Disturb
Call Hold
Ringer volume is 0
Phone Lock
Call Mute
Received Calls
3