Muting a call
If you would like to temporarily mute the audio of a call so that your friend cannot hear you, you can do so by simply clicking on the blue microphone in the chat window. Once you have muted the call, you can click on it a second time while it is crossed out to unmute. Muting may help any echoes that you may be experiencing.
Note: There is no way to hide the video from your camera during a video call.