Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!mit-eddie!uw-beaver!ubc-cs!alberta!calgary!cpsc!hermann From: hermann@cpsc.ucalgary.ca (Michael Hermann) Newsgroups: sci.electronics Subject: Re: Trace-Back on phones Summary: Supported in Canada Message-ID: <2284@cs-spool.calgary.UUCP> Date: 23 Dec 89 11:49:17 GMT References: <89256.111005BHB3@PSUVM.BITNET> <4344@aplcen.apl.jhu.edu> <1732@limey> <5374@udccvax1.acs.udel.EDU> Sender: news@calgary.UUCP Reply-To: hermann@cs-sun-fsg.UUCP (Michael Hermann) Organization: U. of Calgary, Calgary, Alberta, Canada Lines: 16 Here at the University of Calgary, our new (3-4 years) PBX supports "trace-back", displaying the originating number on phones which have an LCD. The PBX is an SL100 made by Northern Telecom. The originating number is only displayed sometimes, indicating that it'll work only if the caller is on a central office with new equipment. Long distance calls invariably have the calling number displayed, which I would assume means the long distance consortium here (Teleglobe Canada) supports "trace-back" as well. An idea for for those of us who might want to make use of this feature: How about an answering machine that scans the header, and only lets the call through if the calling number is on an "accepted" list? 8-) 8-) | Mike Hermann | hermann@cpsc.ucalgary.ca ..!uunet!ubc-cs!calgary!hermann _Organized_ religion is like organized crime; it generates huge profits, preys on people's weaknesses, and is nearly impossible to eradicate.