Re: Linux support for voice modems?

From: Haines Brown (brownh_at_teufel.hartford-hwp.com)
Date: 05/04/05 

Date: Wed, 04 May 2005 14:11:05 GMT

Thanks for the follow up. Basically, my earlier impressions are
confirmed - FAX operates at a normal frequency, and so must reside on
the phone side of the output from a DSL filter.

This implies that the old problem of signal discrimination
remains. The conventional options seem to be a) a dedicated FAX line,
b) a distinctive ring to differentiate a voice call from an incoming
FAX.

Why I have a difficulty with this is because it seems to me that years
ago I had a card (German? "Catseye"?) that could discriminate between an
incoming voice call and an incoming FAX. It sent FAXes to the printer
and voice messages to ring the phone. If I recall corretly, the phone
never rang unless it was a voice call. Am I imagining things, having a
senior moment?

Are there FAX machines that are smart enough to know if the incoming
signal is a voice message or FAX, and rings the phone only if it is
the former? Or, more to the point, if one wants to send and receive
FAXes from the computer, is there an analog modem card smart enough to
discriminate between incoming voice and FAX?

For example here an incoming signal passes through a DSL filter to
either the computer's NIC card or to a FAX/modem card. This modem card
is smart enough to know to reroute the signal either to ring the phone
or to have the computer store or print a FAX. Is this at all
possible?

                              | --> DSL adapter --> NIC
incoming --> DSL splitter --> |
                              | --> FAX/modem card | --> voice phone
                                                   |
                                                   | --> print fax
                                                
I use fax too little to make a dedicated line worthwhile, I would
like to send/receive FAXes from the computer, and I would not want my
phone to ring if it is only a FAX coming in. Am I dreaming?

       Haines Brown
       KB1GRM

Relevant Pages

  • Re: Linux support for voice modems?
    ... > incoming voice call and an incoming FAX. ... > and voice messages to ring the phone. ... briefly, saying that if a non-voice call is detected, vgetty can be ...
    (comp.os.linux.hardware)
  • Re: Phone/Fax separation
    ... incoming) and for FAXing, out going and incoming. ... To automatically separate the voice calls from the FAX calls I have a ... The use of a CommShare switch has one fault, ... it continues to ring until the caller hangs up. ...
    (microsoft.public.windowsxp.general)
  • Re: Linux support for voice modems?
    ... > a fax) isn't possible without another line or distinctive ring, ... > incoming calls and decide what to do. ... > briefly, saying that if a non-voice call is detected, vgetty can be ... I infer that while vgetty might discriminate between voice and ...
    (comp.os.linux.hardware)
  • Re: Linux support for voice modems?
    ... >>a fax) isn't possible without another line or distinctive ring, ... >>incoming calls and decide what to do. ... I infer that while vgetty might discriminate between voice and ...
    (comp.os.linux.hardware)
  • Re: Changing Sky+ Box
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