Officejet Pro 8600 Plus will not send or receive fax

Question

  I have connected the fax machine to the phone outlet, the fax machine dials to another fax machine, the connection sounds like it is being made (the receiving fax machine sends out a noise signalling that it has received a phone call) and then the HP Officejet Pro 8600 Plus says that is is "Connecting" but no fax is sent. Nor can I receive a fax, even though the phone rings on the Officejet Pro 8600 Plus.   The error code I get is Error 388 which is that a communication error occurred during fax transmission.  However, this message occurs regardless of the fax number that I send to, and I had the recipient check that the receiving fax machine was working fine for transmittals from others.
Is it possible that the proble is that  I cannot send or receive faxes through a digital phone line?  That seems odd to me given that almost all phone lines in the modern era are digital.  How do I send and receive faxes with the Officejet Pro 8600 Plus if the only phone lines available are digital?  Also, 4 months ago, I used the same phone line for the same machine, and the fax function worked, but my phone provider assures me that the only phone lines that they have ever provided are digital.
Thank you.

Answer 1

Hello,
I am sorry to hear you are having issues with the fax functionality on your Officejet 8600 plus. I have found a document that has several troubleshooting steps you can try to narrow down the issue. I know some of these steps you have already done, but there might be a few that you haven't, like there is a HP test fax service you can use to test functionality.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02891758&cc=us&dlc=en&lc=en#N226
Good luck!
I work for HP, However, I am speaking for myself and not for HP