In Wiltshire, Uk, in 2003, a pilot plan for precisely what is now often known as "Chatting CCTV" was place into action, allowing operators of CCTV cameras to speak from the camera through a speaker when it is needed. There are lots of modern CCTV cameras that could be used https://history-of-muay-thai59269.wikicorrespondent.com/6176175/fascination_about_closed_circuit_camera_system