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From: dave@westmark.westmark.com (Dave Levenson)
Newsgroups: comp.dcom.telecom
Subject: Re: 800 Scrambled ANI
Message-ID: <16799@accuvax.nwu.edu>
Date: 11 Feb 91 03:43:32 GMT
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X-Telecom-Digest: Volume 11, Issue 111, Message 4 of 12


In article <74381@bu.edu.bu.edu>, john@zygot.ati.com (John Higdon) writes:

In reply to what

> Mark Steiger <penguin@pro-igloo.cts.com> writes:

> You are being put on, big time. When you dial any number, the switch
> you are dialing into is programed to "pre-translate" or expect a
> certain number of digits based on the first digits you dial. If you
> dial "1-800" the switch will expect seven more digits and then becomes
> deaf to any more. There are no secret back doors here.

Some of MCS's 800 service subscribers receive ANI from MCI in the form
of a string of DTMF immediately after they answer, and before the
voice channel is cut through.  If the called party's CPE is stupid
enough, it may be possible to send _it_ some extra DTMF digits after
the voice channel is cust through, and fool it.  At best, however,
this would only work with those MCI customers who use brain-damaged
ANI receiving systems. 


Dave Levenson		Internet: dave@westmark.com 
Westmark, Inc.		UUCP: {uunet | rutgers | att}!westmark!dave
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