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Listen to a busy signal from North America.

Listen to a busy signal from North America used prior to 1980.

Listen to a busy signal from Europe.

Listen to a busy signal from the France

Listen to a busy signal from the United Kingdom.

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A busy signal (or busy tone or engaged tone) in telephony is an audible call-progress tone or audible signal to the calling party that indicates failure to complete the requested connection of that particular telephone call. (Full article...)