John,
in a previous life we did this by sending the data to a Fax server via Cloverleaf(R) the institution had and then the Fax Server actually delivered the Fax.
Once everything was configured properly, this worked well for us.
Jim Kosloskey
email: jim.kosloskey@jim-kosloskey.com 30+ years Cloverleaf, 61 years IT – old fart.