Article View: sci.electronics
Article #14762Re: Telephone Number scanner
From: Henry Spencer
Date: Wed, 18 Nov 1992 23:53
Date: Wed, 18 Nov 1992 23:53
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In article <92322.005201U53817@uicvm.uic.edu> <U53817@uicvm.uic.edu> writes:
>Anyone heard of a program which when using a standard 2400 modem (Hayes AT
> commands, etc.) which tells you the incoming telephone number?
Can't be done. The information is not available to the modem.
It's not available to *anything* on your end of the phone line unless you
pay the phone company for "caller ID", which is an optional extra-cost
service. Once you've done that, suitable equipment can pick it up. Some
of the very newest modems can do this, but old ones can't. The signalling
conventions are odd (more precisely, archaic), and the modem has to listen
to the line *before* picking up the phone, which old ones can't do.
--
MS-DOS is the OS/360 of the 1980s. | Henry Spencer @ U of Toronto Zoology
-Hal W. Hardenbergh (1985)| henry@zoo.toronto.edu utzoo!henry
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Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!utcsri!utzoo!henry From: henry@zoo.toronto.edu (Henry Spencer) Subject: Re: Telephone Number scanner Message-ID: <Bxxrp3.C4@zoo.toronto.edu> Date: Wed, 18 Nov 1992 23:53:21 GMT References: <92322.005201U53817@uicvm.uic.edu> Organization: U of Toronto Zoology Lines: 15