Canon VB-M40 Operation Manual page 145

Message
No audio device.
Failed to initialize Canon Network Camera Audio
Receiver.
Message
Image display for Viewer PTZ use is restricted.
The [Audio] button has been clicked when there is no audio device or the
audio device has been disabled in the PC.
ActiveX plugin is not installed within ten seconds after clicking the [Audio]
button.
The image display for the Viewer PTZ is restricted by settings in the camera.
List of Viewer Messages
Explanation
Explanation
8
8
-17