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Path: utzoo!linus!decvax!ucbvax!ucdavis!lll-crg!qantel!ptsfa!l5!gnu
From: gnu@l5.uucp (John Gilmore)
Newsgroups: net.bugs.uucp
Subject: Modem doesn't hang up provokes misdirected flame
Message-ID: <364@l5.uucp>
Date: Sat, 28-Dec-85 19:23:20 EST
Article-I.D.: l5.364
Posted: Sat Dec 28 19:23:20 1985
Date-Received: Sun, 29-Dec-85 20:13:56 EST
References: <115@sat-bc.UUCP> <478@uwvax.UUCP> <5821@fortune.UUCP>
Organization: Nebula Consultants in San Francisco
Lines: 19
Summary: Dialin & dialout works with cheap modems...

In article <5821@fortune.UUCP>, mats@fortune.UUCP (Mats Wichmann) writes:
> Moral of story - if using affordable equipment, make sure it is
> affordable enough that you can buy two - one dialin and one dialout.
> Otherwise empty your bank account buying a modem with an external
> dialer. Sorry, not an elegant solution.

Maybe the real moral is that if you buy "affordable" system software,
buy two modems.  Sun's uucp and tip support dialin & dialout on the
same port with cheap modems and it works great.  I have a 1-port system
with a Hayes Smartmodem and only have minor trouble with it.

The key is that the driver must support talking to a modem which is not
indicating "carrier detect", but must generate a HUP when carrier drops
(so a line drop won't hang the port).  You set the modem switches so
carrier detect actually reflects carrier on the phone line, but the
driver selectively ignores this indication when dialing out.

Don't complain about the modems -- they work.  Fix your software.
I'll repost the driver fix if enough people haven't seen it.