AT&T MERLIN LEGEND Release 2.0 MLX Queued Call Console Operator's Manual page 101

Features
To Turn off the Headset's Microphone
You can turn off the headset's microphone during a call using
one of the following buttons:
Headset Mute (Headset/Handset Mute). Press once.
The red light goes on, and the caller cannot hear you.
Press again to resume conversation.
Speaker. Press once. The call is transferred from your
headset to the speakerphone. Press again to return
the call to your headset.
4-28 Headset Features