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11-17-2008 10:35 AM - edited 11-17-2008 10:50 AM
This should be useful for you. It has the 3 digit error codes for both send and recieve errors during faxing.
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I am an ex-HP Employee.
12-01-2008 11:01 PM
Try running the Fax test. Press setup > Tool> Run Fax test.
This will give you instructions about what you need to check and what you need to do if it failed on some of the tests.
Then try to send a fax to the fax server. Good luck!
Former HP Employee