Requirements for listening to incoming audio
To listen to incoming audio from your cameras, you must have:
A microphone attached to a camera.
Note
When a camera in your surveillance system has a microphone attached, you can play audio without any additional settings needed. The audio icon on the camera toolbar shows whether the audio feature is available.
Sufficient user permissions.
Note
Access to the incoming audio feature may be restricted depending on your user permissions. Ask your system administrator if in doubt.