Yealink t20p クイック設定ガイド

There is an incoming call to the account, or there is a call on hold

The phone is in idle status whether registered/unregistered

The account is active

Steady green

Blinking green

Off

Off

Power on

Steady green

Power off

Blinking green

There is an incoming call to the account, or there is a call on mute

Directory

Off

The monitored account is in idle status

Steady green

Fast Blinking green There is an incoming call to the monitored account

 Slow Blinking green The monitored account is on an conversation

Press      button during a conversation to mute the current call, the icon    will be shown on the LCD, 

and the power indication LED will blink

Press      again to get the microphone return to normal conversation

and then the corresponding line key will blink 

When the call is answered, press the CONF button, the conference call will now include you and the 

other two parties

It is inactive as BLF