While on an active call:
- Press the Mute button to disable outbound audio from the phone on whichever audio path you are currently using (handset, speakerphone, or headset). You will still hear inbound audio from the call while the call is muted.
- Press Mute again to re-enable outbound audio.
The Mute button remains lighted while the call is muted. Mute is removed automatically if you place a call on hold and then retrieve it.