[1] From: "Richard L. Goerwitz" <richard@goon.stg.brown.edu> (18)
Subject: callback
Willard, if you have Unix machines on-hand, you can set up callback
trivially. For example, I recently got tired of getting into our sys-
tems at STG via Brown's modem bank. So I stuck a modem on my office
line.
But how can this work, with a phone line in active use? How, e.g.,
can my wife get in while I'm at the office, presumably working :-)?
And how can the modem distinguish calls from my home from, say, off-
hours business calls that should go to voicemail?
I get around this problem simply by setting the software to listen for
a single ring, followed by a hangup, then a pause of 30 seconds, then
another ring. The modem answers on the second ring. From home I set
up my dialer to connect using this exact timing and pattern.
It's quite nice, and spares STG the expense of a second line. And my
modem almost never tries to answer a business call - even one that comes
in after hours during the time when I often dial in via modem.
But like I said, I can only tell you how to do this on a Unix machine.
Unix machines have been answering modems since the 70s, so they're
pretty good at doing cool (bizarre) stuff like the above....
Richard Goerwitz
[Unfortunately, perhaps, I do not have a UNIX machine, so the question
remains: how to configure Windows NT for callback? --WM]