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- Newsgroups: sci.electronics
- Path: 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
-
- 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
-