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From: cucstud!wb8foz@uunet.UU.NET (David Lesher)
Newsgroups: comp.dcom.telecom
Subject: Re: How To Locate Your Ringback Code
Message-ID: <telecom-v09i0029m07@vector.UUCP>
Date: 25 Jan 89 00:41:10 GMT
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X-TELECOM-Digest: volume 9, issue 29, message 7

I have found many, but not all BOC's use 55n-xxxx where xxxx
is the  last 4 of the ntbrb (thats nUMBER tO bE rUNG bACK) and
n varied from CO to CO. I found 0,1,2,3 in various places.
The operative prefix was one NOT in use in that local dialing
area, of course.
I have had cases where I could not easily get the dang thing to
let go of the line when I was done;-{
Of more interest to me  is the ANI number. In Cleveland, it
was 200+any 7d, except the correct #. If you had a wrong # the
ANI voice kindly told you which pair you were on. That was a
godsent when you had 30 trunks and you wanted to figure which
was where. It also gave out interesting numbers when used on
out-WATS lines.