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                          http://www.phreaksandgeeks.com
                      Telemarketers Don't you just hate them
                                   By: ic0n
                                Email: ic0n at phreaksandgeeks dot com             
                                                   
	I really hate telemarketers they always calling at the worst times. I've
    kind of lost my humor over the last few years so I don't even give them a 
    hard time anymore. When I did give them a hard time I used to tell them 
    whom ever they asked for was dead or something similar to that. 

	Well anyways I have an unlisted telephone number and I used to get at 
    lease 20 calls a few from telemarketers. I really did not have the money
    to buy a telezapper and I had what was rumored to be the tone the 
    telezapper played but I never could get it to work. So at that time I 
    decided to do some research to see if there was any information out 
    there. I really did not find much info out there but I found decent 
    amount of information.

	Telemarketers use software on there computer system. I sure you could
    find it on the net somewhere. It's called 'Predictive Dialer' What the 
    program does is similar to what a wardialer does only it makes a list of
    valid numbers and invalid numbers. There's a hole in the program and you
    can use there technology against them. 

	When telemarketers call there's a short silence before a 
    operator/salesperson comes on the line. If you answer the phone and say 
    anything when they call they will add your number to the valid list. If
    the software detects a fax machine it will attempt to send you a fax 
    selling crap. They will add your number to a fax list. To make matters
    ever worse they sell there valid list to other telemarketing company's. 

	There 3 tones that the software looks for. 985.2,1370.6,1776.7 htz.
    If it detects these tones the software where think that your line is a invalid
    number. If you've ever called a disconnected or invalid number you've heard 
    these tones before. 

	All your going to need is a answering machine that will allow you to 
    change the out going greeting/message or have voicemail. Once you download 
    the tone or create one yourself with a tone generator program. 

	Record the tone onto your answering machine or voicemail greeting. Play
    the tone wait a few seconds then finish with your basic message. 

     Here's an example.
    <tone> Wait 5 seconds then you have reached 313-373-1337 leave a message 
    after the beep.

	When the software detects the 3 tones it will take your number and add
    it to the invalid number list. When they do this they won't sell your number
    to other telemarketers. So doing this will stop about 90% of your telemarketers. 

	This will not prevent all telemarketers from calling but after only 2 days
    I noticed a great drop in calls from them. On a final note this is FCC approved
    and is perfectly legal. 

At this time you can download the Sit tone from The telco-insiders website at
http://telco-inside.spunge.org/  here's a direct link to the file.
http://telco-inside.spunge.org/telezapper.wav