Phreaker Abatement

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http://www.visual-traffic.com/hacker.html

Phreakers are computer hackers that break into telecommunication systems illegally. This site is devoted to helping companies prevent phreaker intrusion. A list of "Immediate Actions" is provided, such as change all passwords, know where every serial port is in your company, which phone codes to deny (such as 700, 809, and 900 prefixes), and more. If you are a systems manager or information services person, visit this site to learn about how to prevent phreaking in your company. It will be worth your time.