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'[EE]: Yet Another Telephone monitor'
2002\08\01@125413 by Lawrence Lile

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Years ago small businesses could buy a two line switch pretty reasonably at
Radio Shark.  Now they just give me a dumb look.

My father-in-law has a situation where he would like a system to answer his
phone:  "Press 1 if you want Joe, Press 2 if you want Jim"  the phone siganl
would end up in two places, either at his renter's house, or his cabin right
out back which he stays in all summer.  Right now, he jsut has a phone line
to both, resulting in the inconvenience that everyone tries to answer
everyone else's calls.

Is there anything like this out there?

--Lawrence

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2002\08\01@130510 by Josh Koffman

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What about distinctive ringing? It should be available in most areas.
Get a distinctive ring switch (sometimes a fax switch, etc). You'd have
to pay each month for another number, but there would be no rewiring
needed. I know a non monthly cost situation might be preferable.

Building a simple two choice answering system shouldn't be too hard. ISD
chip to record the quick message, then a dtmf decoder to figure out what
button was pressed. I guess you'd then have to generate a ring signal to
ring the correct phone.

Hope that helps,

Josh
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Lawrence Lile wrote:
> My father-in-law has a situation where he would like a system to answer his
> phone:  "Press 1 if you want Joe, Press 2 if you want Jim"  the phone siganl
> would end up in two places, either at his renter's house, or his cabin right
> out back which he stays in all summer.  Right now, he jsut has a phone line
> to both, resulting in the inconvenience that everyone tries to answer
> everyone else's calls.

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2002\08\01@134032 by Peter L. Peres

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This sounds like a PIC application + ISD chip + line interface + DTMF
decoder ;-)

Peter

On Thu, 1 Aug 2002, Lawrence Lile wrote:

{Quote hidden}

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2002\08\01@145301 by Larry Williams

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better yet, just get a line restrictor from Radio Shack, part number
43-445 for $9.99 each. prevents extension from picking up. put one on
each telephone line, and neither can interfere with the other,
automatically switches phone #2 out when phone #1 picks up.  can use as
many as you like if you have 4 phones, get 4 devices, one for each
line/telephone or just use a fax switch. Then the calling party decides
who will answer.

Lawrence Lile wrote:
{Quote hidden}

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2002\08\01@190413 by Lyle Hazelwood

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As I am slowly piecing my home control system together,
one of the "later someday" ideas is to add a similar type
of switch to my residential line.. While this method is not
directly applicable to your situation, some may find these
(as yet just dreamware) ideas interesting.

I have seen Caller ID units that include a standard serial
port for ASCII output. Since I'll be wiring my own
house up for all the goodies, I'll tie all the phone lines
together in a star configuration. Later when this part
of the project is done, I'll be able to add relays to
selectively ring only particular phones based on the
caller ID number.

I am hoping to get my system to not only know what
rooms are occupied, but WHO is in each room. That
way, if a caller is recognized as the friend of a particular
family member, only the phone in the room that they are
in will ring. Of course, unrecognized callers or callers
recognized as other family members (in-laws) will
ring house wide.

Anyone on this list that does not see the value of this
feature has probably never had a 14 year old daughter.

I'll get there, I just have other parts of the project
to finish first.

{Original Message removed}

2002\08\01@211812 by Robert Rolf

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Wouldn't it be cheaper to just get her her own phone line?
Or better yet, a cell phone with unlimited minutes of service?
That way you'd be able to call her to come home for dinner (yeah, right),
or she can call for a ride when everyone is too drunk to safely drive.

Lyle Hazelwood wrote:
{Quote hidden}

So how do you plan to handle the 'pickup' of a phone when
it is NOT ringing? It's not easy to separate the 'ringer' lead
on today's electronic phones.

{Quote hidden}

> {Original Message removed}

2002\08\02@055513 by Alan B. Pearce

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>And I picked up a 'fax router' switch at a garage sale that
>had a canned voice that said 'Press * for fax'. Joe would
>just have to tell his callers that he was the fax machine <G>.

Actually I would do it the other way around, be on the fax line myself. Keep
all those cold calling sales people at bay :))))

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2002\08\02@072822 by Lyle Hazelwood

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----- Original Message -----
From: "Robert Rolf" <spam_OUTRobert.RolfTakeThisOuTspamUALBERTA.CA>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Thursday, August 01, 2002 5:36 PM
Subject: Re: [EE]: Yet Another Telephone monitor


> Wouldn't it be cheaper to just get her her own phone line?
No.
> Or better yet, a cell phone with unlimited minutes of service?
One day, perhaps. But she has demonstrated the ability to lose anything
she is given. The likelihood of her losing an item is proportional to the
cost
of that item. She would be asking for a replacement cell phone within a
week.
> That way you'd be able to call her to come home for dinner (yeah, right),
> or she can call for a ride when everyone is too drunk to safely drive.
>

What I am suggesting is an installed capability of the home, not a specific
feature for one occupant. I used my daughter simply as an example of
one reason why it would be handy to have.
As described below, this could also be used for telephone privacy
if needed, Turning on an outside ringer only when it is appropriate,
Knocking an answering machine off line if someone really picks up,
Setting up a user-managed Call Blocking feature based on Caller ID
and/or time of day,
preventing "pick up's" while the computer is on line (If I ever give up
DSL),
or even to troubleshoot a dead(off-hook) phone line. If I ever add a
second phone line, I could manage auto-switching by adding a second
bank of relays and not have to replace all the phones in my home with
two-line models. The longer I think about it, the more options I can
realize.

If  the modem also supports DTMF decoding, a call logger could
easily be implemented (Both for incoming and outgoing)


{Quote hidden}

I had planned on using relays to disconnect the lines of the
phones that should not ring, only during the ring cycle.
Yes, relays are crude stuff, but they're cheap and tolerant
of line spikes. If I can devise a detector for On/Off hook,
any off-hook signal could drop all relays to the normally
closed position, enabling all phones.

I may be over-simplifying, but a phone switcher like this should
be fairly simple to build. A PIC and a half dozen small relays can
handle the switching. I'll probably use an old modem with Caller ID
for the input, and I already have committed a PC for home management,
so the list processing is easily configured and managed.
The more "custom" part is wiring all the phones in a star rather than daisy-
chaining them together, but I plan on a lot of custom wiring in my home,
so this really doesn't present a problem for me.

As a single feature, it probably wouldn't be worth building. My own
experience with home automation is that the various features of the
home complement each other when combined, increasing the usefulness
of all other features. Example: Knowing not just room occupancy, but
WHO is in each room is not a trivial task, but it adds the ability to
"Zone" incoming phone calls. It also adds the option of setting personalized
temperature and entertainment settings for each occupant.

There's a lot more to do before it's all realized. I have done this kind of
thing
for many years as a hobby. I'm just tired of using "off the shelf" home
automation
stuff and being limited in what I can accomplish. By designing my own system
from the ground up I can keep my options open for whatever crazy ideas I
might
dream up in the future.
One Key to making this all worthwhile is an easy interface. I won't be using
PIC's
for the logic behind the system. The computer I have dedicated to mastering
the
system is extremely easy to program. The PIC's provide remote, intelligent
I/O
only.

Enough rambling, time to go to work.
Lyle

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2002\08\29@011104 by Amaury Jacquot

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Asterisk, the free software PBX could do that easily (and more - voice
mail,...)

check http://www.asteriskpbx.com

Sincerely

Amaury

On Thu, 2002-08-01 at 12:41, Peter L. Peres wrote:
{Quote hidden}

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