1. Go to an ongoing phone conversation.
  2. Click Listen In to join the conversation. Your microphone will be muted so the other participants won't be able to hear you.
  3. Click Unmute to join the conversation.
  4. Click on Mute to turn off your microphone again.
  5. Click Leave to leave the conversation.

Click Listen in to listen to the conversation

Click Unmute to join conversation

Click Leave to stop listening to the conversation

Please note that "Listen-in" option is available for users with the "Admin" role only.