Plantronics HUB: How to Mute/Unmute the Headset
You can mute and unmute your headset using Plantronics HUB.
To mute or unmute your headset, click the headset icon in the System Tray.
To mute the device, click Mute. The headset icon turns red to indicate the device is muted.
To unmute the device, click Unmute. The headset icon turns green to indicate the device is unmuted.