Re: flexfax: modem 1000$ question

["Larry Lipstone" <lrl@stoneware.com>]

Jay R. Ashworth wrote...
> 
> Apparently some modems can listen for CNG on the line before answering,
> to allow them to distinguish incoming fax calls, which they should
> answer, from incoming voice calls, which they shouldn't.
> 
> Inasmuch as most CO switches no longer send transmit audio until the
> call is answered, I don't see why this might be useful, but what they
> hey...

Probably to share the line with an answering machine (or maybe even a
human?), so that it will pick up the line only for a fax call, taking
the call away from the machine or other being.

Larry