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That may be owing to call waiting service. It's commonly that way, anyhow.
I would advise either disabling call waiting on the line, or inserting number codes that will do the same, into the dialed number for the sent fax, such as an initial
* 7 0
and a pause before the number..
Let me know if that cannot be the solution, or might not be the solution, or if you need further solutions that I can suggest.
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