AT&T MLX-10D, MLX-28D, MLX20L - page 99

Features
To Turn Headset/Handset Mute On and Off
1.
2.
To turn on, press programmed Headset/Handset Mute button
while using the handset or a headset.
The red light next to the button goes on, and the caller cannot hear you.
To turn off, press programmed Headset/Handset Mute button
again.
The red light next to the button goes off, and the caller can hear you.
Headset/Handset Mute 5-33