Busy signal
Type of call-progress tone / From Wikipedia, the free encyclopedia
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For other uses, see Busy signal (disambiguation).
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.
Listen to a busy signal from North America, Hong Kong, and South Korea.
Listen to a busy signal from North America used prior to 1980.
Listen to a busy signal from Europe.
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The busy signal has become less common in the past few decades due to the prevalence of call waiting and voicemail.