Does GFI FaxMaker support US Robotics modems? Author: Luis Fernandes November 30, 2018 04:14 Answer Certain US Robotics modems are supported by GFI FaxMaker. The supported US Robotics modems can be found here. Related articles How to troubleshoot issues with modems ( ONLY) Modems Supported by GFI FaxMaker What does Busy tone detected: 43 mean? Does NetPrintQueue2Fax support to send faxes in Landscape format?