In Wiltshire, United Kingdom, in 2003, a pilot plan for what is now called "Speaking CCTV" was put into motion, permitting operators of CCTV cameras to speak from the camera through a speaker when it is needed. Ordered their eight camera 4K bullet system and additional two fisheyes. All hardwired. https://sergiononll.madmouseblog.com/14579327/security-camera-closed-circuit-secrets