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HP All-in-One and Fax Products - Troubleshooting 'Phone Off Hook' Front Panel Messages
A Phone Off Hook message may not be an error. It simply 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:
Checking the phone line
The most common reason for this message is when a dial-up modem is accessing the Internet on the same phone line. Just as two phone calls cannot come in at the same time, two devices cannot use the phone line at the same time.
ISDN/PBX can have 2 calls at the same time but only one call per port.
If a broadband modem (such as ADSL or ISDN) is on the same phone line and the message appears all the time, please do the trouble shooting below and if the message remains then contact your Internet provider for assistance. Even if a dial tone is present when listening to the phone line, the HP product may detect the broadband data connection at the higher line frequencies. Broadband modems must have a line filter installed to work correctly. Contact the telephone company for assistance.
Using a Telephone Answering Machine, Telephone or other telecommunication device
Follow the steps below to setup a telecomunication device with the HP Fax machine.
Using ISDN or PBX
If you have your HP Fax product installed on an ISDN A/D converter or a PBX, please check the following: