Extend Fax Line over LAN

I'm looking for a way to extend a single POTS line over IP to a remote site. ATT is unable to move the number to the destination site and I'd rather not use fax forwarding. The new faciliity has new POTS numbers, however the department that is moving is focused on tax preparation and they've already registered with the IRS and is pre-printed this number on thousands of forms. I need a way to bridge the gap through 2019 until they reregister and reprint 2019 forms next Winter with their new number.

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I've seen some posts regarding ATA's; does anyone have experience forwarding a fax signal over IP to a remote receiver?

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Thanks in advance