In telephony, beep lines were improvised conference calls hosted over busy signals, loop-around test tones, or certain automated informational service numbers, active in the United States from the early 1950s to the mid-1980s. These lines allowed callers to communicate with up to dozens of other people simultaneously, the conversations often punctuated by the busy tone "beep" and accompanying intercept message.
In telephony, beep lines were improvised conference calls hosted over busy signals, loop-around test tones, or certain automated informational service numbers, active in the United States from the early 1950s to the mid-1980s. These lines allowed callers to communicate with up to dozens of other people simultaneously, the conversations often punctuated by the busy tone "beep" and accompanying intercept message.
Source: Wikipedia "Beep line" · CC BY-SA 4.0
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