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TUCoPS :: Phreaking Technical System Info :: anivscid.txt

ANI versus Caller ID




From: Greg Tompkins <gregt@4tacres.com>
Newsgroups: comp.dcom.telecom
Subject: ANI vs CALLER ID
Date: Sun Jun  4 20:27:55 1995

The other day, I called a company and requested information.  The lady
said "I have your number as [my phone number] an ANI listing".  How
did she do this?  Is there a device that would let me do this to know
who is calling?  How is this different than Caller ID?

Another question about ANI. I called 1-800-MY-ANI-IS with my cell phone 
and it gave a totally different number than what my cell number is.  I
tried to call the number that ANI gave me and it said "You have reached a 
disconnected number."  Why doesn't it give my regular number?  I was
roaming once, and it gave me the number of the phone.


GREG


[TELECOM Digest Editor's Note: ANI and Caller-ID are quite similar but not
entirely the same. The end result is the same; the called party gets the
phone number of the caller. From residence phones, for all intents and
purposes the information via Caller-ID and/or ANI is one and the same.

When you call an 800 number, you *cannot* withhold your number from the
called party. The use of *67 is overridden by ANI delivery. Sometimes 
ANI is delivered after the fact -- like once a month with the phone bill --
and it can also be delivered in realtime, just like Caller-ID on display
units. Most large companies get it in realtime as well as on their bill
each month. 

Cellular phones seem to always deliver 'out of area' messages to Caller-
ID boxes. Where ANI is concerned, they always seem to deliver the number
of the outgoing trunk line on the cellular carrier's system rather than
the actual cellphone number itself. I don't know why. When I used my cell
phone to call my 800 number, the 800 ANI a month later on the bill showed
a number which when traced through the Ameritech Name and Address service
came back listed to something called the 'IBT Company' at a *suburban*
address (even though the cell phone was a 312 number). Further checking 
into that address showed it was a telco central office building. Dialing
the number got the message that the number was not in service for incoming
calls.  I don't know why they do things the way they do.    PAT] 



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