Path: utzoo!attcan!uunet!wuarchive!texbell!vector!telecom-gateway
From: cowan@marob.masa.com (John Cowan)
Newsgroups: comp.dcom.telecom
Subject: Re: While Phone Rings, Charges May Begin
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Date: 11 Aug 89 17:34:15 GMT
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In article  tanner@ki4pv.uucp
(Dr. T. Andrews) writes:
>Do payphones not use out-of-band signalling?  It would seem to invite
>abuse if they used in-band signalling, especially if someone were
>inclined to carry a recording of money being dropped into the thing.


What you describe is called a "red box", and generates three different
tones:  5 cents (ding), 10 cents (ding ding), and 25 cents (blonng).
More modern payphones perhaps use out-of-band signaling, but long ago and
far away, a recording of those noises would serve quite well in deceiving the
operator.  Details suppressed to protect the guilty.
--
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