Imagine that your company has just replaced its outdated phone system with an Internet telephone setup promising nifty features and big cost savings. All of sudden, your office phones start ringing off the hook with pre-recorded ads pitching hair tonics and imported drugs.

As an increasing number of companies and individuals make phone calls through the Internet, phone systems can become as vulnerable as computer networks to hackers, computer viruses and network disruptions.

By Eric Lai at Biz Journals.

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