Press the Mute key.
The Mute indicator starts blinking to indicate the microphone has been muted.
To cancel mute, press the Mute key again.
The Mute indicator turns off to indicate that mute has been cancelled.
If the digital audio input/output device is connected, you cannot mute them from the machine. For details about how to mute the digital audio input/output device, see the respective manual for device.