All members of the camera and sound crew on the studio floor wear headsets. Through these they receive the general production intercom (talkback) and the program audio.
This may be a communal system, in which everyone on the intercom circuit is heard. In another arrangement, the studio team hear just the director and an assistant. Other production-team members (technical director, video engineers, etc.) use access-keys or separate private-wire circuits to talk to the crew. Cameras can reply over their headset microphones, or on a nearby studio microphone.
It is best to keep instructions or discussion brief on intercom. A lot of unnecessary chat can be tiring to listen to. People tend to ‘switch off’ mentally, and assume ...
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