Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!apple!portal!cup.portal.com!dbell
From: dbell@cup.portal.com (David J Bell)
Newsgroups: sci.electronics
Subject: Re: smart fax
Message-ID: <42894@cup.portal.com>
Date: 2 Jun 91 20:01:39 GMT
References: <1118@xroads.UUCP>
Distribution: usa
Organization: The Portal System (TM)
Lines: 23


>
>I was looking at a fax machine the other day and the flyer said it
>could tell if the incomming call was a fax or a voice. 
>How can it tell?

>John
>-- 
>The Arizona High-Tech Times
>John R. Schuch , Editor
>(602) 967-7444   
>via the Crossroads :  hplabs!hp-sdd!crash!xroads!schuch

Well, if the call was from Bobby McFerrin, maybe it couldn't!

The calling station puts a tone on the line, as soon as the
connection goeas through. The receiving station recognizes it
and reponds (handshakes) with a return tone. If the caller *doesn't*
supply the tone, the "smart fax" assumes it is a person calling, and
1) Rings the local "bell" on the fax machine
2) Supplies a simulated ring signal to the caller

Dave