Although I can't really help you integrate with another system, I can tell you that the communications between NetBotz and DCE is simply http/https. Pulling the current image would be something like this:
The only NetBotz that officially support the 165 camera pod are the NetBotz Rack monitor 750 and wall 755.
Older units like the 570 and 450 did support onvif cameras but have never been tested with the camera pod 165 and due to the discontinuation of the version 3 NetBotz appliances, this will not be officially tested. Please note that there is no motion detection option on the version 3 appliances with an onvif camera.