Fax error "Completed (Error) 033-545"

[DavidX28897-xrx]

033-545 The remote machine might not be a facsimile, or it is not in the facsimile mode.

Procedure

1. Advise the customer to check the address number and whether the remote party is a fax machine.

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Basically no fax machine picked up on other end. 

Try dialing that number on a cell and listen for beeps and bops. 

[ajsmith227]

Where can I find what this code means?