Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!ucbvax!agate!telecom-request From: floyd@ims.alaska.edu (Floyd Davidson) Newsgroups: comp.dcom.telecom Subject: Re: Hidgon an Expert on 2600 Hz? Message-ID: Date: 24 Mar 91 07:35:04 GMT Sender: Telecom@eecs.nwu.edu Organization: University of Alaska, Institute of Marine Science Lines: 35 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 234, Message 10 of 10 In article forrette@cory.berkeley.edu (Steve Forrette) writes: > John Higdon writes: >> For the record, there was another way calls could be rotary dialed >> without hard wire. Many LD tandems used to respond to pulses of 2600 >> Hz and would complete calls based on numbers "dialed" in this manner. >> Hence, 2600 Hz would serve as both supervisory and signaling carrier. >> It was called "SF" (single frequency). > You seem to know an awful lot about what 2600Hz can be used for! :-) > [Moderator's Note: And what about you Steve? Are you familiar with the > process also? Do you use it a lot at your place? :) For those not > in on the joke, 2600 hz was long used as a fraud tool by phreaks to > override the billing equipment and make calls for free. If you want to > know *how*, write each other -- NOT me! I have enough problems this > century, and I won't answer nor will I print any letters on the subject. I'd be quite happy to discuss the use of 2600Hz on trunks with anyone who wants to. From 'x' type SF units (the ones with tubes) to what is used today. But first a little comment: You poke a 2600Hz tone on a trunk through *my* toll switch and one of two things happens, 1) nothing if it is a ccis trunk, or 2) a nice log report prints out telling everyone what trunk and what the calling number and called number were. Talk about blue-boxing all you want, but don't even think of using one. Floyd L. Davidson | floyd@ims.alaska.edu | Alascom, Inc. pays me Salcha, AK 99714 | Univ. of Alaska | but not for opinions.