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From: lemson@ux1.cso.uiuc.edu (David Lemson)
Newsgroups: comp.dcom.telecom
Subject: Re: 800 Scrambled ANI
Message-ID: <74380@bu.edu.bu.edu>
Date: 10 Feb 91 02:36:27 GMT
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X-Telecom-Digest: Volume 11, Issue 106, Message 5 of 11


penguin@pro-igloo.cts.com (Mark Steiger) writes:

> A friend of mine said that with a touch-tone phone and his "secret
> code" you could eliminate any records of you calling the 800 number.
> He said, you dial the number, wait a second, then dial this number.
> Your phone number won't show up on their bill (if they have that
> service).

This sounds like an "extender" in phreaker-ese.  In order to mask your
phone number, you dial into a "special" dial-in line of a PBX system,
dial a special code (sometimes), and then get a dial tone.  Now,
you're on an outgoing line from the PBX as though you were physically
located on the premises of the PBX.  Sometimes, you can make LD calls
this way and have it billed to the company owning the PBX, sometimes
(often, nowadays) LD calls are blocked and the only use for this is
masking your own number to SS7.  The ANI at the 800 center will show a
number allocated to the company's PBX instead of your own.  Obviously,
illegal and immoral.  (Unless you happen to have the permission of the
company owning the PBX, or its your own :-)

I read somewhere (probably TELECOM Digest) about a 900 service where
you dial the 900 then get a dial tone, dial another number, and get
connected to whomever you want.  The final party does not get your
phone number through ANI, and the intermediate company gets some money
charged to you as the 900 call.  Another way to do this, without the
phreaking element.


David Lemson    U of Illinois Computing Services Student Consultant
Internet : lemson@ux1.cso.uiuc.edu   University of Illinois, Urbana


[Moderator's Note: Does anyone remember those two 900 numbers? I went
to look for the little plastic card I recieved and I can't find it.  PAT]