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Fax detection

P

Patrick

Jan 1, 1970
0
Hi,

I'm looking for a way of detecting if a fax is making my phone ring or
if it is a voice call. I'd like to have only one phone number,
therefore one unique ringtone. So far I thought about building a
device that would answer any calls after 5 rings. After it answers I
would like it to determine if this is a voice call or a fax calling.
Maybe this is impossible, or maybe there is no precise way of doing
this but I am hoping that all faxes send somekind of handshake within
the first second after the call is answered (that way I could wait
1sec for the handshake, and if I don't get any, route to answering
machine)

Anyone could tell me if there is such a mechanism?
 
P

PeterD

Jan 1, 1970
0
Hi,

I'm looking for a way of detecting if a fax is making my phone ring or
if it is a voice call. I'd like to have only one phone number,
therefore one unique ringtone. So far I thought about building a
device that would answer any calls after 5 rings. After it answers I
would like it to determine if this is a voice call or a fax calling.
Maybe this is impossible, or maybe there is no precise way of doing
this but I am hoping that all faxes send somekind of handshake within
the first second after the call is answered (that way I could wait
1sec for the handshake, and if I don't get any, route to answering
machine)

Anyone could tell me if there is such a mechanism?

Troll... Try google!

Peter's Troll-o-Meter

Not Troll Troll
0 1 2 3 4 5 6 7 8 9 10
/
/
/
/
/
/
/
O

(Pegged the needle!)
 
J

Jim Thompson

Jan 1, 1970
0
Hi,

I'm looking for a way of detecting if a fax is making my phone ring or
if it is a voice call. I'd like to have only one phone number,
therefore one unique ringtone. So far I thought about building a
device that would answer any calls after 5 rings. After it answers I
would like it to determine if this is a voice call or a fax calling.
Maybe this is impossible, or maybe there is no precise way of doing
this but I am hoping that all faxes send somekind of handshake within
the first second after the call is answered (that way I could wait
1sec for the handshake, and if I don't get any, route to answering
machine)

Anyone could tell me if there is such a mechanism?
[/QUOTE]
[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
 
J

Joerg

Jan 1, 1970
0
Jim said:
[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 ;-)

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.
 
P

Phil Hobbs

Jan 1, 1970
0
PeterD said:
Troll... Try google!

Peter's Troll-o-Meter

Not Troll Troll
0 1 2 3 4 5 6 7 8 9 10
/
/
/
/
/
/
/
O

(Pegged the needle!)

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

Cheers,

Phil Hobbs
 
M

mpm

Jan 1, 1970
0
Hi,

I'm looking for a way of detecting if a fax is making my phone ring or
if it is a voice call. I'd like to have only one phone number,
therefore one unique ringtone. So far I thought about building a
device that would answer any calls after 5 rings. After it answers I
would like it to determine if this is a voice call or a fax calling.
Maybe this is impossible, or maybe there is no precise way of doing
this but I am hoping that all faxes send somekind of handshake within
the first second after the call is answered (that way I could wait
1sec for the handshake, and if I don't get any, route to answering
machine)

Anyone could tell me if there is such a mechanism?

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
 
J

Joerg

Jan 1, 1970
0
mpm said:
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.)


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.
 
V

Vladimir Vassilevsky

Jan 1, 1970
0
Joerg wrote:

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).

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.
Internet will never reach the
reliability of POTS, it's not as well organized and AFAICT never will be.

Probably true.

Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com
 
R

Ross Herbert

Jan 1, 1970
0
Hi,

I'm looking for a way of detecting if a fax is making my phone ring or
if it is a voice call. I'd like to have only one phone number,
therefore one unique ringtone. So far I thought about building a
device that would answer any calls after 5 rings. After it answers I
would like it to determine if this is a voice call or a fax calling.
Maybe this is impossible, or maybe there is no precise way of doing
this but I am hoping that all faxes send somekind of handshake within
the first second after the call is answered (that way I could wait
1sec for the handshake, and if I don't get any, route to answering
machine)

Anyone could tell me if there is such a mechanism?

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.
 
R

Robert Baer

Jan 1, 1970
0
Vladimir said:
Joerg wrote:




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.
** The Federal DNC list, for me, is almost useless.
I get calls from marketeers ranging from unleaded gas futures, to
FOREX futures - and many of them are illegally unregisterd.
And the so-called securities regulatory agencies refuse to do anything.
And no, i have never done business with any of these assholes, i have
been on the Fed DNC list for over 2 years, and have an unlisted number.
 
J

Joerg

Jan 1, 1970
0
Ross said:
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.
 
L

LVMarc

Jan 1, 1970
0
Patrick said:
Hi,

I'm looking for a way of detecting if a fax is making my phone ring or
if it is a voice call. I'd like to have only one phone number,
therefore one unique ringtone. So far I thought about building a
device that would answer any calls after 5 rings. After it answers I
would like it to determine if this is a voice call or a fax calling.
Maybe this is impossible, or maybe there is no precise way of doing
this but I am hoping that all faxes send somekind of handshake within
the first second after the call is answered (that way I could wait
1sec for the handshake, and if I don't get any, route to answering
machine)

Anyone could tell me if there is such a mechanism?
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
 
W

Wim Ton

Jan 1, 1970
0
I'm looking for a way of detecting if a fax is making my phone ring or
if it is a voice call. I'd like to have only one phone number,
therefore one unique ringtone. So far I thought about building a
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
 
J

Jim Thompson

Jan 1, 1970
0
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
 
R

Rich Grise

Jan 1, 1970
0
** The Federal DNC list, for me, is almost useless.
I get calls from marketeers ranging from unleaded gas futures, to
FOREX futures - and many of them are illegally unregisterd.
And the so-called securities regulatory agencies refuse to do anything.
And no, i have never done business with any of these assholes, i have
been on the Fed DNC list for over 2 years, and have an unlisted number.

I heard about some guy who, when the telemarketer called, he'd say, "Oh,
good. May I have the name and billing address of your company, your
name, and your supervisor's name? I must inform you that our charge for
the use of our private equipment in the conduct of your business is
$100.00 per minute."

He didn't say if he got any takers. ;-)

Cheers!
Rich
 
M

mpm

Jan 1, 1970
0
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.

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
 
K

krw

Jan 1, 1970
0
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.)

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...
;-)
 
K

krw

Jan 1, 1970
0
** The Federal DNC list, for me, is almost useless.
I get calls from marketeers ranging from unleaded gas futures, to
FOREX futures - and many of them are illegally unregisterd.
And the so-called securities regulatory agencies refuse to do anything.
And no, i have never done business with any of these assholes, i have
been on the Fed DNC list for over 2 years, and have an unlisted number.

If it's on the DNC list it's not unlisted. ;-/

I think I've only gotten one unsolicited call in three or four years.
Cell phones have benefits, other than the obvious. Even politicians
don't call them. :)
 
R

Robert Baer

Jan 1, 1970
0
Rich said:
I heard about some guy who, when the telemarketer called, he'd say, "Oh,
good. May I have the name and billing address of your company, your
name, and your supervisor's name? I must inform you that our charge for
the use of our private equipment in the conduct of your business is
$100.00 per minute."

He didn't say if he got any takers. ;-)

Cheers!
Rich
Not too bad, but some just hang up when asked for the required info.
 
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