Busy line interrupt, also known as emergency breakthrough, is a function of telephone land line carriers in which a telephone operator, by request of a caller, interrupts an existing phone conversation between other parties. This is especially useful for services without call waiting.
Busy line interrupt, also known as emergency breakthrough, is a function of telephone land line carriers in which a telephone operator, by request of a caller, interrupts an existing phone conversation between other parties. This is especially useful for services without call waiting.
Source: Wikipedia "Busy line interrupt" · CC BY-SA 4.0
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