vgetty, rockwell, and incoming data calls: a FAQ?

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>Vgetty currently uses #3. The interesting question is, if there are fax
>machines or modems, that do _not_ produce a fax calling tone. My personal
>experience is, that all fax machines _do_ send a fax calling tone.

When brought this up before, I think Gert said there were fax callers
without fax calling tones.  I assumed it was a European thing.

>If this
>is true, we could simply change vgettys behaviour to use #1 instead of #3.
>Can somebody with a lot of fax traffic comment about this?
>
>Another simple solution would be to map the DTMF number received to the
>above list. So Sending a DTMF 1 would result in a data carrier from the
>modem and so on.

That seems to be the optimal solution; you could say in your greeting to
press 2 for fax.  If the person is calling with fax equipment that doesn't
generate fax calling tones, they could use the DTMF to get around the
problem.

>This is also esay to do, but it is still the question, what
>to do, if there is only silence on the line. The current implementation
>catches theoretically all possibilities, but it relies of course on a
>working implementation of the auto detect for data/fax of the modem.

>It's the old question: Should we support a broken modem by dropping support
for
>other cases?

Here in the US, the voice modem with class 2 fax choices are all broken:
Rockwell based or 3com/US Robotics.  So you get to choose between bad
fax/data discrimination but OK fax, or good fax/data discrimination, and
buggy fax.  I'll take the former, as long as I can work around the problems.
If there is a sportster voice with acceptable class 2 fax, I'd love to hear
about it.

>I think, I will add a new option to the voice.conf file:
>answer_mode_silence with default voice:fax:data.

I think this, along with the 1 for data, 2 for fax, would be wonderful.

>Fax and data calling tones are in any case the recommended method.


Yes, it's unfortunate that the predominant modem makers and endemic OS
vender conspire to make data calling tones difficult to use.

Thank you for your response, and of course for vgetty.