Talk Down Surveillance System To Protect Food Truck

We are trying to help a client protect their expensive food cart/ trailer. The client has invested a significant amount of money in a custom trailer that allows them to take their restaurant mobile. They are very concerned about theft, vandalism, etc. The trailer needs to be kept at their location and there is not a structure that would allow it to be safely enclosed. They are considering a tall chain link fence as a first line of defense. We suggested integrating 2 or 3 cameras, outdoor motion detectors or photo beams, a simple alarm panel, good lighting either on timers or motion activated, and a talk down feature that would allow playing a recorded warning. The idea would be that based on an event, the warning would play and hopefully send the intruder on their way. We would also have the system monitored with instructions for the owner to be called based on an event. The owner would have the option of looking at the live video and either "talking" or whatever.

We have minimal experience using speakers and microphones on Axis cameras and I am not sure if it would be best to use the existing audio inputs/outputs on the camera or maybe there is a better way to implement this?

Any suggestions are appreciated.

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