In Wiltshire, United Kingdom, in 2003, a pilot scheme for what exactly is now called "Speaking CCTV" was put into action, allowing operators of CCTV cameras to speak with the camera by way of a speaker when it is necessary. Analog cameras, one of several earliest sorts of CCTV cameras, https://griffincawtn.spintheblog.com/34491572/the-2-minute-rule-for-closed-circuit-camera-system-with-monitor