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From: SEWALL@UCONNVM.BITNET.UUCP
Newsgroups: comp.sys.apple
Subject: Hanging up the modem
Message-ID: <8705061242.aa02449@SPARK.BRL.ARPA>
Date: Wed, 6-May-87 10:00:00 EDT
Article-I.D.: SPARK.8705061242.aa02449
Posted: Wed May  6 10:00:00 1987
Date-Received: Fri, 8-May-87 04:35:48 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
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Generally, I get connected to wherever I call and the other
end hangs up on termination.  However, systems and modems are
flaky, and I do occassionally have a need to send the modem
(I have a Hayes Smartmodem at home and a Robotics 212A in the
office) a hangup.

Some commware sends the modem a whole string of "setup" codes,
some of which apparently make it difficult to convince the modem
to respond to commands while connected.  I can fix that problem
by sending the modem ATZ (reset to default) before I dial.  Kermit
tells the modem nothing, so it doesn't have that problem.

If I get connected to a modem that won't respond, I've found that the
Hayes standard +++ (wait for "OK") and ATH (tell modem to hangup)
get the job done (some clones may want ATH0 to hang up).