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From: cmoore@brl.mil (VLD/VMB)
Newsgroups: comp.dcom.telecom
Subject: Former 312-Area Ringback Prefixes
Message-ID: <14476@accuvax.nwu.edu>
Date: 8 Nov 90 15:19:56 GMT
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X-Telecom-Digest: Volume 10, Issue 800, Message 6 of 11


An earlier note said that 570 thru 574 were, in the pre-split 312
area, the ringback prefixes.  By 1982, however, 570 was an Evanston
prefix, and it and all the other above-mentioned prefixes were
apparently in use at the time of the 312/708 split, and all of them
moved to 708.  Are 570 thru 574 assigned to anything in the PRESENT
area 312?


[Moderator's Note: Well actually, the correct numbers are 1-571
through 1-577. No area code, but you must use 1 plus the appropriate
three digit code for your CO (571 through 577) plus the last four
digits of the phone you want to ring back. For example xxx-2368 would
be rung back by dialing 1-571-2368 (or 572, 573, whatever applies in
your office -- test 'em all to find out which!) The corect combination
will return dial tone. Flash the hook. The dial tone will change to a
high pitched tone. Two tests are possible: To test the accuracy of the
touch tone pad, punch in 1,2,3,4,5,6,7,8,9,0. If the tones issued are
at the correct frequency, you will hear a double spurt of tone:
Dah-dah!  Test two: Dial 6 and hang up. The phone will ring back.  PAT]