DTMF to Steer Incoming FAX?

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Hello redhat-list,

I have a phone line. (Actually, more than one, but they need to all be
configured the same way.) The line has a modem on it, connected to my
RH 8.0 (or similar) system. Currently, I am running mgetty on the
serial port for the modem, and am successfully able to receive FAX and
data calls on that modem, with no manual intervention.

Data calls come in and are given a login: prompt, allowing the caller
to log in on the system. (Actually, the only thing that is accessible
this way is a specific application, no general dial-up access.)

FAX calls come in and deliver their FAX. The FAX image gets put into
the incoming fax spool directory, and the fax admin gets an Email that
says it arrived and its path.

So far, this is pretty cool.

What we would *like*, is to be able to have this existing behaviour,
with one addition. We would like mgetty to pick up the phone and wait
silently for N seconds, to see whether any DTMF (touch tone) signals
are received, including any digits, star, and pound ([0-9*#]). If any
are received, we want to know what they are. After N seconds, things
should go along as before, accepting data or FAX calls.

The point of all this is to be able to have "source routing" of the
FAX coming in, directing it rather than dumping it into a common
in-box directory. The DTMF information captured at the start of the
call would be used at the end of the call to look up who should
receive the FAX, probably then Emailing it to them. We do not see a
use at this time for DTMF capture related to data calls, just FAX
calls.

I've done some looking around, and have found something that seems
close to what I'm looking for with vgetty and its dtmf_program script.
But I've been unable to find documentation clear enough to let me know
whether it will really do what I'm looking for. I'm not actually
looking to do anything with voice. (Although for my home use, an
all-purpose voice mail, FAX receiver, and data login capability,
perhaps providing me with a ppp connection, would be extra special
nice.)

Has anyone solved this (or a similar) problem? Thanks!

Ron.

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