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> Well, there are two different versions of the fax standard, known as > "class 1" and "class 2.0". The above command simply puts the modem in There are at least 3: 1, 2 and 2.0. > > ModemSetupAACmd: AT+FAA=0 > Now, this did the real trick. The modem immediately started "sounding > like a fax machine" when I made this modification. I think it is far > from obvious from the manuals that this needs to be changed. You'd think > that "Adaptive Answer: no" had the same effect, but apparently not. If the modem remembered the FAA=1, it would need to be explicitly forced into FAA=0. Hylafax doesn't have internal knowledge of how to do this and needs the setup commands.