Forget everything you learned on the Internet!
Most online 'experts' recommend the following (wrong) settings:
- Reduce speed to 9600bps
- Turn off ECM error correction
- Set speed to 14,400
- Make sure ECM error correction is enabled
MENU -> 2. Fax -> 0. Miscellaneous -> 1. Compatibility -> 'normal'
Not sure what your fax machine is set to? Use our ECM Self Test to find out. In addition to testing ECM capabilities, your transmission speed will be listed under "SignalRate".