Camp-on busy signal
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In telecommunications, the term camp-on busy signal has the following meanings:
- A signal that informs a busy telephone user that another call originator is waiting for a connection. Synonym: call waiting
- A teleprinter exchange facility signal that automatically causes a calling station to retry the call-receiver number after a given interval when the call-receiver teleprinter is occupied or the circuits are busy. Synonym: speed-up tone
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