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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.dcom
Subject: Re: modem with call progress detect
Message-ID: <5114@utzoo.UUCP>
Date: Tue, 26-Feb-85 13:10:32 EST
Article-I.D.: utzoo.5114
Posted: Tue Feb 26 13:10:32 1985
Date-Received: Tue, 26-Feb-85 13:10:32 EST
References: <118@lownlab.UUCP>
Organization: U of Toronto Zoology
Lines: 14

> I am trying to find an auto-dialing modem with call progress tone detection.

A number of modems claim to do this, but note that some botch it.  There
is a great deal of variation in what tone signal means what, especially
when PBXes enter the picture.  My own conclusion -- bearing in mind that
I'm a phone/modem user rather than designer -- was that the general problem
is so hard that probably no modem does it 100% correctly.

I have no specific pointers, except that I know that some (all?) Cermetek
products -- which are also sold by other companies under different names --
misinterpret the "ringing" signal of at least one major PBX as "busy".
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry