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| Busy verification ： ウィキペディア英語版 |
Busy verification
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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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