Cisco 8832 User Manual page 39

If you receive unwanted or harassing calls, use malicious call identification (MCID) to alert your
administrator. Your phone sends a silent notification message to your administrator with information about
the call.
Press Report caller.
While you are on a call, you can mute the audio, so that you can hear the other person, but they cannot hear
you.
When you have a call muted, the LED bar lights red.
Press Mute on the phone or Mute
When you press Mute on an expansion microphone, the phone and all microphones are muted.
Press Mute again to turn mute off.
You can put an active call on hold and then resume the call when you're ready.
Press Hold.
on an expansion microphone.