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Partly to dissuade comic prank calls on the radio. Although posted by someone who has no clue — this is Don Imus from the early 1970’s.
Here’s one from Russ Spooner, also in the 70’s, from WMAK in Nashville.
I remember working “back in the day” when the phones in air studios, newsrooms, etc had a sounder that went “bink” every few seconds (I can’t remember the required minimum interval) so the person on the phone new they were being recorded. You may remember this from old phone interviews.
Tim in Bovey