Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: Dave Levenson Newsgroups: comp.dcom.telecom Subject: Re: Phone/Fax Switchbox -- Do They Work? Message-ID: <10278@accuvax.nwu.edu> Date: 1 Aug 90 03:15:21 GMT Sender: news@accuvax.nwu.edu Organization: Westmark, Inc., Warren, NJ, USA Lines: 23 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 532, Message 6 of 10 In article <10235@accuvax.nwu.edu>, gammafax!mikes@uunet.uu.net (mike spann) writes: > The other box (and the one I would select) uses the little known fact > that audio energy is carried down the phone line when the phone is > ringing. (This is commonly known to thiefs who sometimes talk to each > other without answering the phone). An automatic fax machine sends a > calling tone every three seconds while waiting for the phone to be > answered. The phone/fax switch box listens on the line for this I thought the phone/fax switch box answers and then listens for audio from a calling fax machine. If it depends upon the audio sent between rings before answering, then it will only work on the now mostly- obsolete crossbar and step-by-step central offices. The 1ESS, 1AESS, and 5ESS local central office switches do not pass any audio before they receive answer supervision. Dave Levenson Voice: 908 647 0900 Fax: 908 647 6857 Westmark, Inc. UUCP: {uunet | rutgers | att}!westmark!dave Warren, NJ, USA AT&T Mail: !westmark!dave