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

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Hi,

Marc Eberhard wrote:
> 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. 

Yes, there are.  Older fax modems, fax machines with manual dialing (dial
up on the phone, then press <start> on the fax machine), etc.

Nowadays, there are less of them, but "still enough".

> 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?

I have no absolute numbers, sorry.

> 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. 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? 

Yes, but not for the price of sacrifying "working" modems.

> I think, I will add a new option to the voice.conf file:
> answer_mode_silence with default voice:fax:data. Please keep in mind, that
> the order of the entries doesn't have _any_ meaning. That way every user can
> make this decision for her/his own system.

I think this is a good idea.

gert
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Gert Doering - Munich, Germany                             gert@greenie.muc.de
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