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- Q5002256 subject Q8336335.
- Q5002256 abstract "In a public switched telephone network, busy verification is a network-provided service feature that permits an attendant to verify the busy or idle state of station lines and to break into the conversation.A 440 Hz tone is applied to the line for 2 seconds, followed by a 0.5 second burst every 10 seconds, to alert both parties that the attendant is connected to the circuit.".
- Q5002256 wikiPageWikiLink Q1373572.
- Q5002256 wikiPageWikiLink Q17112830.
- Q5002256 wikiPageWikiLink Q243961.
- Q5002256 wikiPageWikiLink Q7695847.
- Q5002256 wikiPageWikiLink Q8336335.
- Q5002256 comment "In a public switched telephone network, busy verification is a network-provided service feature that permits an attendant to verify the busy or idle state of station lines and to break into the conversation.A 440 Hz tone is applied to the line for 2 seconds, followed by a 0.5 second burst every 10 seconds, to alert both parties that the attendant is connected to the circuit.".
- Q5002256 label "Busy verification".