Yealink SIP-T23P User Manual page 13

Overview
Icons appearing on the LCD screen are described in the following table:
Icon Description
Network is unavailable
Private line registers successfully
Register failed/Registering
Hands-free speakerphone mode
Handset mode
Headset mode
Multi-lingual lowercase letters input mode
Multi-lingual uppercase letters input mode
Alphanumeric input mode
Numeric input mode
Multi-lingual uppercase and lowercase
letters input mode
Voice Mail
Text Message
Auto Answer
Do Not Disturb
Call Forwarded/Forwarded Calls
Call Hold
Call Mute
Ringer volume is 0
Keypad Lock
3