Busy-signal meaning

A series of sharp buzzing tones heard over a telephone when the line dialed is already in use.
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An audible (or visual) signal indicating to the calling party that the called circuit is engaged and, therefore, unavailable. In the public switched telephone network (PSTN), a central office (CO) sends the busy signal in the backward direction, i.e., back to the caller. A fast busy signal, or reorder tone, is an indication to the calling party that network resources are not available to process the call. See also PSTN.
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(US, telephony) An audible signal to the calling party that indicates failure to complete the requested connection; an engaged tone.
noun
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