A Phone Off Hook message is shown from the front panel of your HP faxing product. This message indicates that a telephone receiver is off the hook (the handset is lifted) and the telephone line is open.
This message would be expected in the following situations:
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A phone connected to the HP fax (or the same phone line) is using the same phone line as the fax, or a fax handset has been lifted
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A credit card machine or other electronic device is using the phone line
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A Telephone Answering Machine is using the phone line
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The Start Fax button on the control panel was pressed