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? Error: 'Failed to authenticate: AuthenticationFailed There was no endpoint listenting at net.pipe://localhost/Core/CSService' when loading the web interface after migrating GFI Archiver to a new server What does Handshaking Failure 54 mean?