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Busy signal
In telecommunication, the term busy signal has the following meanings:
1. In telephony, an audible or visual signal that indicates that no transmission path to the called number is available. Synonym busy tone.
2 . In telephony, an audible or visual signal that indicates that the called number is occupied or otherwise unavailable. Synonym reorder tone.
Source: from Federal Standard 1037C and from MIL-STD-188
HTTP equivalents of the busy signal include 500 Internal Server Error (generic), 503 Out of Resources, and 403.9 Forbidden: Too Many Users (generated primarily by Microsoft software).
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