> I could be wrong, but I don't think that's how it works. Your modem should 
be
> waiting to hear a "beep" from the sending side. It probably waits about 2-3
> seconds for that tone. If it doesn't hear it, then it answers the call as a
> data call and it's too late to turn around and answer as a fax. The same
> applies going the other way.
 
With a Supra, you can set S192=0 and that way it will accept fax callers
who don't send CNG tones.
 
Regards,
bgfax author
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