Fax detection

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0 1 2 3 4 5 6 7 8 9 10 / / / / / / / O

(Pegged the needle!)

[snip]

There are boxes you can buy that sense the fax tones and switch to your fax, or ring the phones if it's voice.

I had one years ago before there were PC's ;-)

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
         America: Land of the Free, Because of the Brave

Multi-Function printers also do that nicely, such as the MFC-7820N here in the office. Connect its fax jack to the phone jack, plug the answering machine into the jack labeled "Answering Machine", done.

--
Regards, Joerg

http://www.analogconsultants.com/

With you around, I imagine it's up around 9 or 10 all the time.

Cheers,

Phil Hobbs

It's a logarithmic scale.

If your fax accepts distrinctive ring, that's another possibility. We just yanked our business fax line out. I think we were getting something on the order of 3 faxes a year (2 of those were junk mortgage offers).

Everything's email now. (Except attorneys, of course.)

-mpm

Until the Internet goes out for a day or some web master thinks he is smarter than all the others and blocks a whole domain to reduce spam. Happened numerous times. Boy was I grateful for that backup fax machine (and so were others here that used it). Internet will never reach the reliability of POTS, it's not as well organized and AFAICT never will be.

--
Regards, Joerg

http://www.analogconsultants.com/

I wish it could be a phone blackist similar to SPAMCOP, DSBL, ORDB or like. So the phone spamwhores could be rejected automatically. Unfortunately, the business phone numbers can't be on the non-call list. Also, non-call lists do not help against the so-called non-profit organizations.

Probably true.

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant

or

As far as the PSTN is concerned a fax machine is no different from an ordinary telephone handset when originating a call.

Only after the receiving end answers a call does the fax machine send its signature tone, and that is the only time it is possible to determine whether a call originates from a fax machine or not.

Some fax machines (auto mode) work on the principle that when an incoming call remains unanswered (by a human) after X number of rings, the call should be answered by itself. If, after answering, the fax machine does not hear any tone from an originating fax, it assumes the call is from a telephone and it then activates its own incoming call sounder once more to try to attract the attention of a human to take a voice call. However, this procedure usually takes so long that by the time a human (if present) hears the second incoming call sounder the originating caller has hung up.

Mine does it differently. It switches to the answering machine right away but cuts that off again when it detects a fax tone. The answering machine then thinks it was a hang-up. Since the fax tone (usually) comes much earlier than the beep of the answering machine the result is exactly what I want: A fax in the tray and no message indicated on the machine.

--
Regards, Joerg

http://www.analogconsultants.com/

and if you want to turn those powerful SINGLE LINE telephone gadgets and favorite items , so that they work stemless ly and with no eternal power supply, on TWO lines (an be two pstn lines, two voip lines and the ever popular mixed pstn and voip lines where the sources are disparate) then you need "Combine-a-line" tm.

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Best regards

Marco Polo

SNIP

Not really, AFAIR. According to the CCITT standard (T30??), the called party has to say first: "I am a fax". instead of the caller saying "I am a fax". At my office we had a fax that strickly followed CCITT and always had trouble with automatic fax switches.

Wim

All the internal fax modems that I know of begin sending the query tone just as soon as they complete the dialing, irrespective of whether the called end has yet answered.

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
         America: Land of the Free, Because of the Brave

This is my experience as well. I would add that my "all-in-one" printer/fax also send tones immediately after dialing (outbound fax).

-mpm

Even they've converted to email. I've been emailing signatures back and forth to patent attorneys for a couple of months. They send the forms, I print, sign, scan, and email back. I've been doing the same with my real estate agent. Everyone still wants the original signatures by snail-mail though.

I was thinking about getting a fax, but since I have no phone line... ;-)

--
  Keith

Hmmm...my stock broker was satisfied that i included a scan of my signature and never asked for an original.

...

Well, you got rid of the telemarketer, didn't you? ;-)

I don't know why people don't just get an answering machine. At work here, the receptionist answers the phone, if it's for me, they page me, and I have to go out into the shop to use the phone out there.

Telemarketers don't stay on "hold" for very long. ;-)

Cheers! Rich

Wim Ton snipped-for-privacy@bluewin.ch posted to sci.electronics.design:

If that is the standard, it must be in the top ten most disobeyed standards on the planet.