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From: dave@westmark.westmark.com (Dave Levenson)
Newsgroups: comp.dcom.telecom
Subject: Re: FAX Machine at Home: Options for Incoming Transmissions
Message-ID: <68896@bu.edu.bu.edu>
Date: 16 Nov 90 04:51:48 GMT
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In article <14682@accuvax.nwu.edu>, JMS@mis.Arizona.EDU writes:

[ regarding voice/fax switching boxes ]

> charge.  My big question on this option is, "how many FAX machines
> present CNG tones?"  Is this something which all FAX machines built in
> the last two or three years have, or is this a feature which some FAX
> machines built even today don't have?  Anyone know any more about
> this?

All current-production fax machines are capable of producing CNG
tones.  The problem is that some operators of these machines don't use
them that way.  My fax machine is equipped with a handset, and may be
used as an expensive replacement for a standard single-line telephone.
If I lift the handset and dial your number, my machine thinks I'm
placing a voice call, and sends no CNG tones.  If your fax machine
answers, I can then drop a document into my machine and press the SEND
key.  But if your switch answered while I was on the handset, and
listened for my CNG tone, it would decide that I'm placing a voice
call, and direct it to your telephone set.

If I insert the document, and dial your number, and press the send
key, my machine will know in advance that I'm trying to send a fax,
and it will then generate the tones.

The question is, how many fax users understand these details well
enough to send a fax to your fax machine?


Dave Levenson			Internet: dave@westmark.com
Westmark, Inc.			UUCP: {uunet | rutgers | att}!westmark!dave
Warren, NJ, USA			AT&T Mail: !westmark!dave
Voice: 908 647 0900		Fax: 908 647 6857