Caller ID

Caller ID

Post by Kevin Mark Wo » Fri, 04 Nov 1994 05:36:48

Would a Caller ID display unit fed by a scanner tuned to a cordless phone
(or cellular phone) function properly? I know there are at least a few
requirements.  

* The scanner must be tuned to the cordless phone being called.
* The owner of the cordless phone must be a Caller ID service subscriber.
* The Caller ID decoder on the cordless phone base transmitter must not
  filter out the Caller ID signals or codes.
* The base transmitter must send the ring signal to the phone handset by
  radio. I think all handsets do get their ring through the air as opposed
  to an electrical connection when resting on the base/charger. (I am
  assuming that the Caller ID is embedded in the ring or sent inaudibly
  immediately after the ring.)

Of course, nobody in the United States should do this -- unless they
switch to another frequency right before conversation begins. Or is
monitoring ring signals prohibited as well?   :-)

 
 
 

Caller ID

Post by Shawn4s » Sat, 05 Nov 1994 23:53:46


Kinda wild!  We just got Called ID on Tuesday and of course with me and my
gadgets, I got it on.... Tuesday!  :-)

That's what I like about this group- always something creative going on!
So who's going to be the first to tell me how to wire up a cord that will
have an RCA on one end and the phone jack on the other?  I have two phone
lines so I can call and see if it really works- I have a cordless, a
Caller ID box and a PRO 2006...

I like the EDUCATION!

 
 
 

Caller ID

Post by Glen L. Rober » Sun, 06 Nov 1994 07:39:16

: Kinda wild!  We just got Called ID on Tuesday and of course with me and my
: gadgets, I got it on.... Tuesday!  :-)

: That's what I like about this group- always something creative going on!
: So who's going to be the first to tell me how to wire up a cord that will
: have an RCA on one end and the phone jack on the other?  I have two phone
: lines so I can call and see if it really works- I have a cordless, a
: Caller ID box and a PRO 2006...

: I like the EDUCATION!

Listen on the scanner and see if you hear the databurst between the first
and second rings...

You can hear it on the phone line, if you monitor the line without make
it go off-hook.

If you can't hear it on the scanner... you need a different model phone.
Some may, some maynot send it.

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Caller ID

Post by Steve Pet » Mon, 07 Nov 1994 14:42:36




: : : So who's going to be the first to tell me how to wire up a cord that will
: : : have an RCA on one end and the phone jack on the other?  I have two phone
: : : lines so I can call and see if it really works- I have a cordless, a
: : : Caller ID box and a PRO 2006...

: Isn't that ring something like 80VAC??  That's not something I'd like
: to pump through my scanner.

I do not know the freq for the datburst but if you want to put audio out
from a phone line into a line level input, it's very simple...

get a 600ohm isolation audio xformer (rat shack cat# 273-1374) and a .47
UF capasitor... place the .47 uf cap in series with the phone line on the
input side of the xformer and the output of the xformer to an rca cord...
walla a wire tap that does not drop the voltage on the line enough to
keep the phone off the hook, you can leave it hooked up all the time, put
on an aux input on your tape deck and make it easy to record any calls
that come in, even better find a way to mod a call i.d. box for a
reconizable # to trip a relay to start the deck.

Steve

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Caller ID

Post by Thomas J. Harre » Mon, 07 Nov 1994 12:43:53


: : So who's going to be the first to tell me how to wire up a cord that will
: : have an RCA on one end and the phone jack on the other?  I have two phone
: : lines so I can call and see if it really works- I have a cordless, a
: : Caller ID box and a PRO 2006...

: Listen on the scanner and see if you hear the databurst between the first
: and second rings...

Isn't that ring something like 80VAC??  That's not something I'd like
to pump through my scanner.
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Caller ID

Post by bill nels » Thu, 10 Nov 1994 16:36:19


:
: : Listen on the scanner and see if you hear the databurst between the first
: : and second rings...
:
: Isn't that ring something like 80VAC??  That's not something I'd like
: to pump through my scanner.

Not on a cellular or cordless phone. Also, it is trivial to block the
ring voltage. No, I am not going to explain how. Buy a caller-id box
and look in it.

Bill

 
 
 

Caller ID

Post by Julian C Gramm » Tue, 15 Nov 1994 11:33:56


[much snip]

Quote:>Isn't that ring something like 80VAC??  That's not something I'd like
>to pump through my scanner.

It could well be. I'm not up to speed on US TComms, but if the
system is anything like UK, The so-called 80VAC would actually be a
bias of 50VDC (some prefer +25V and -25V :-),  but the pd remains
the same) with an AC superimposition for the ring. If I'm anywhere
close, an in-line capacitor (select your value carefully) would be
a good start. I still wouldnt want to feed the signal in directly!

Julian

 
 
 

Caller ID

Post by Glen L. Rober » Wed, 16 Nov 1994 05:14:30


:  

: [much snip]
: >Isn't that ring something like 80VAC??  That's not something I'd like
: >to pump through my scanner.

: It could well be. I'm not up to speed on US TComms, but if the
: system is anything like UK, The so-called 80VAC would actually be a
: bias of 50VDC (some prefer +25V and -25V :-),  but the pd remains
: the same) with an AC superimposition for the ring. If I'm anywhere
: close, an in-line capacitor (select your value carefully) would be
: a good start. I still wouldnt want to feed the signal in directly!
:  

: Julian

I said nothing about the ring being 80VAC... its more like 90.

--
-------------------------------------
Glen L. Roberts, Editor, Full Disclosure
Host Full Disclosure Live (WWCR 5,065 khz - Sundays 7pm central)

Does 10555-1-708-356-9646 give you an "ANI" readback? With name?
email for uuencoded .TIF of T-Shirt Honoring the FBI
Remember, fd _IS FOR_ Full Disclosure!