Question about HP Officejet Pro L7780 All-In-One InkJet Printer
I use a VOIP line and get the same error msg. Here's what I do- I dial the fax number with the line unplugged (hence no off-hook message), press "start Fax", and as soon as I hear the fax machine "Click" to pickup the line, I put the line in the machine. Works every time!
Posted on Dec 26, 2010
Sounds like a good solution stljeffjohns, but that's not a permanent solutions and sounds like a lot of trouble. Try to look for the solution in the HP Officejet Pro L7780 Manual
Posted on Jan 22, 2014
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Posted on Jan 02, 2017
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