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From: dalegass@dalcsug.UUCP
Newsgroups: comp.dcom.modems,comp.sys.ibm.pc
Subject: modem troubles
Message-ID: <179@dalcsug.UUCP>
Date: Sun, 1-Nov-87 22:08:42 EST
Article-I.D.: dalcsug.179
Posted: Sun Nov  1 22:08:42 1987
Date-Received: Mon, 2-Nov-87 04:36:23 EST
Organization: Dalhousie University, Halifax, N.S., Canada
Lines: 26
Xref: utgpu comp.dcom.modems:986 comp.sys.ibm.pc:8253

Having a bit of a trouble with my modem in answer mode.  Just wondering if
anybody has had similar problems, or would know how to fix it:

When my modem's in answer mode, and a call comes in, here's what happens:

it sends a high-pitched tone, and waits for the caller to make some noise.
At this point, I can drop the DTR and hang up, and all is well.

If the caller sends a valid carrier, then the connection is made, the
carrier is detected, I can drop the DTR to hang up, and all is well.

However, if, after sending this high-pitched tone, certain noise (but not
a valid carrier) is received by the modem from the phone line (busy signals,
dial tones, or any shhhhhh sound), then the modem response with a harsher
carrier (shhhhh--which I think is normal) and hangs bad, probably looking
for a valid carrier, after hearing some indication of noise.

Nothing short of a power-down will remedy this hangup (dropping DTR fails,
+++ fails, etc. etc.)

This is very annoying, as any bogus call with any form of noise on the line
will hang the modem until I come to rescue it.

Any suggestions?

dalegass@dalcsug.uucp