From Bright Pattern Documentation
How to Mute a Call
During a conversation you can use the Mute button to temporarily disable your microphone so that the other party on the call cannot hear your voice.
- Click the Mute button once to mute the call. The Mute button will change its appearance to and the same mute status icon will appear next to the call timer in the Active Communications List.
- Click the Mute button again to unmute the call.
You can also use the Alt-X keyboard shortcut to mute/unmute the microphone.