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'[EE]: Anybody ever thought of making this?'
2001\05\18@110925 by John Craft

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Anybody ever heard of, or thought of trying to make a home phone line
interface for a cell phone?

This device would provide the home line with a dial tone and accept the
DTMF information and then dial the cell phone and "link" the two
together, and on the other side, provide a ring when a call is comming
in.

With free nationwide long distance being offered these days for a decent
amount per month, why have a land line?  If I could slip my portable
into a "base" station and it provide service for my internal phone
system, I'd buy it.

Anybody?

John C.

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2001\05\18@115338 by bob

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Yes is the short answer.  I read about a device in one of the trade comms
mags last year which did exactly what you suggested. But I never seen one,
don't know anyone who has one and haven't seen any advertisements since.

It is basically a very good idea but there is some problems.

1 Each cell phone uses different codes to mimic the keyboard. Even from the
same manufacturer!

2 Some phones just won't do it.

3 Phone manufacturers guard their protocols very closely (Nokia is infamous
for this) and although some codes are now known this is achieved by reverse
engineering and if implemented in a saleable product would likely have Nokia
or whoever dragging you through the courts for copyright infringement.

However I don't mean to be negative, this is a very desirable product and
all but the last point can be overcome. An open source project with everyone
participating would be nice.

Bob.




{Original Message removed}

2001\05\18@120630 by Wayne Hortensius

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At 10:06 AM 5/18/01 -0500, John Craft <spam_OUTjcraftTakeThisOuTspamDIAMONDDATA.COM> wrote:
>Anybody ever heard of, or thought of trying to make a home phone line
>interface for a cell phone?
>
>This device would provide the home line with a dial tone and accept the
>DTMF information and then dial the cell phone and "link" the two
>together, and on the other side, provide a ring when a call is comming
>in.

NovAtel Communications essentially built this capability into one of their
cell phones back in 1994. There was a small black box (it really was
black!) that plugged between the phone line and the cell phone. You could
make and receive calls over the landline or the cell. Even provided CLID
info for incoming landline calls. Worked like a charm; But AFAIR it didn't
really sell all that well.

Regards,
Wayne

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2001\05\18@132446 by Josh Koffman

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Actually, Motorola used to (still?) have a device call "THE Cellular
Interface". Basically it does all you said. It was originally marketed
to those "road warriors" who wanted to use a fax machine and modem while
driving down the freeway to work. Um, anyway, this was before there were
cellular capable modems, and modem capable cell phones. Personally, I
think it's neat that I can buy a cable that is basically just a serial
cable and plug my cell phone into my computer. That said, I refuse to
spend $100 on a such a simple cable...out of principle of course. But I
digress. THE Cellular interface is a great little device. Assuming you
can find one somewhere, It might work for you. I don't know if it would
work on a digital phone though. The other thing would be to make sure
that the little 9 volt battery inside is enough to drive all the ringers
in your house. And of course, what if more than 1 person picks up the
phone. Anyway, I agree it would be a great project, because not only
would you save money, but you'd have the same phone number either way.
Of course, that does mean it's much harder to hide...

Josh
.....joshyKILLspamspam@spam@mb.sympatico.ca

John Craft wrote:
{Quote hidden}

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2001\05\18@134812 by Chris Carr

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> Anybody ever heard of, or thought of trying to make a home phone line
> interface for a cell phone?
>
> This device would provide the home line with a dial tone and accept the
> DTMF information and then dial the cell phone and "link" the two
> together, and on the other side, provide a ring when a call is comming
> in.
>
> With free nationwide long distance being offered these days for a decent
> amount per month, why have a land line?  If I could slip my portable
> into a "base" station and it provide service for my internal phone
> system, I'd buy it.
>
> Anybody?
>
> John C.
>
What you require is a dual standard GSM/DECT phone with a DECT Base Station
connected to your Pots line.

There are one or two obstacles to making a GSM Base Station, regulatory and
technical, so I would say that this is a non-starter.

Regards

Chris Carr

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2001\05\18@182753 by Alexandre Domingos F. Souza

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>NovAtel Communications essentially built this capability into one of their
>cell phones back in 1994. There was a small black box (it really was
>black!) that plugged between the phone line and the cell phone. You could
>make and receive calls over the landline or the cell. Even provided CLID
>info for incoming landline calls. Worked like a charm; But AFAIR it didn't
>really sell all that well.

       Motorola also has it for all the phones they do (did?)...

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2001\05\18@183701 by Alexandre Domingos F. Souza

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>Anybody ever heard of, or thought of trying to make a home phone line
>interface for a cell phone?

       This is fairy common in Brazil...

>This device would provide the home line with a dial tone and accept the
>DTMF information and then dial the cell phone and "link" the two
>together, and on the other side, provide a ring when a call is comming
>in.

       I have one for the motorola PT550 :o)

>With free nationwide long distance being offered these days for a decent
>amount per month, why have a land line?  If I could slip my portable
>into a "base" station and it provide service for my internal phone
>system, I'd buy it.

       In USA it can make sense. In Brazil I pay around 75c/minute using my cellular :o((( The "good" side is that I pay nothing for having it - I buy a phone (this one I got for free), activate it for around $15 (with $15 in credit for calls) and no money is spent anymore :o) Need I say that I never place a call on my phone? :o)

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2001\05\18@225417 by klpauba

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I looked over just this type of device today.  Check out this link for
Vox.Link:

http://static.hellodirect.net/4143.htm

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2001\05\19@105801 by Peter L. Peres

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I know someone who did this. It's a commercial product. I will try to find
out what it is called by Monday.

> This device would provide the home line with a dial tone and accept the
> DTMF information and then dial the cell phone and "link" the two
> together, and on the other side, provide a ring when a call is comming
> in.

Peter

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2001\05\19@144422 by Matt Bennett

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John Craft wrote:
>
> Anybody ever heard of, or thought of trying to make a home phone line
> interface for a cell phone?
>
> This device would provide the home line with a dial tone and accept the
> DTMF information and then dial the cell phone and "link" the two
> together, and on the other side, provide a ring when a call is comming
> in.
>
> With free nationwide long distance being offered these days for a decent
> amount per month, why have a land line?  If I could slip my portable
> into a "base" station and it provide service for my internal phone
> system, I'd buy it.
>
> Anybody?

Yes- when I worked for Andrew Corporation, I worked on one- We called it
"Extensis".  Andrew didn't sell them directly- we were going to make
them for the cell-phone manufacturers.  Ours was originally based around
a Nokia phone, but because of a major limitation, we had to drop Nokia
support initially (when you hook up externally, the phone assumed you
were a modem, and stayed in analog mode, which was a real killer).  We
modified it later to work on Motorola Star-Tacs, and it worked really
well.  Andrew has a press release for it here:
<www.andrew.com/whatsnew/pressreleases/viewpressrelease.asp?id=346&langid=1>.
I don't work for them anymore, but I do believe that this is a good
product, and it was actually worked on by a pic-lister.  They have since
added back in the Nokia support.

Our objective was to make it indistinguishable from a normal wired
phone.  Ours was based around an Atmel 4414 (maybe an 8515, its been
almost a year since I worked on it).  They may have changed this because
of the awful availability problems with Atmel last year.  There were a
bunch of challenges to it- the call progress tones (dial-tone, etc.)
were originally made by a very expensive and very limited availability
call-progress tone generator.  I made a subroutine and hardware that
eliminated the CPTG with a synthesized tone generated by idle cycles of
the processor.  Also, the rules for when you hit the "send" button are
actually pretty complex, so I made an algorithm to figure out when.  I
distinctly remember our pilot build- we had 50 made by a contract
manufacturer, and I think less than 10 worked correctly out of the box.
We had less than 2 days to get them working and out to our
beta-testers.  That was a real troubleshooting blitz.

A major limitation is that there was a pretty tight patent on the idea-
we bought rights from the patent holder.

Matt

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2001\05\20@215821 by Gennette, Bruce

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This is one of the things that Blue Tooth promises - all electronic and
communications devices automatically form into an ad hock network whenever
they come into each other's presence (about 10m) and (according to rules you
or your communications company sets) they route your data/transaction/comms
via the most appropriate device in the net.

Blue Tooth chip sets are already cheap and are targeted to be under $10 by
the end of this year.

Bye.

{Original Message removed}

2001\05\26@081924 by Craig Lee

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We also built one at NovAtel.  It incorporated cordless phone technology
and cell phone technology in one.  So that if you were within the range
of the cordless base station, you would use that.  If you were out of
range, it would use the cell base station.  Since we made our own BTSs
as well, we built support into them.

As far as I know, we built a few prototypes and that was it..

{Original Message removed}

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