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Is the fax on a new hookup to the phone line?
Or has the fax always been working until recently, on this phone line with this hookup/setup?
What happens when you try to send a fax? and does it happen with more than one number?
Please let me know, by the Reply To Expert function. I will try to help you with this, to a solution to the problem.
Does the problem only appear with one destination fax number?