You would need a driver to be installed that would act as a printer (how most of the faxing software works) so to the user it is just like printing, and the faxing software handles sending the file(s).
If your printer has a driver which allows you to print to it (and then it passes that along to faxing software) then yes it is possible... but why not print out a hard copy and fax?
Plus try the manufacturer's web site, they may have some info, utilities, drivers, etc for AutoCAD or Autodesk products.
