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Police in Australia are
investigating a case of IP telephony fraud that may cost three Perth businesses
a total of $70,000. VoIP attacks "usually occur over weekends in order to
maximize the amount of time the breaches will go unnoticed," explains Police
Sergeant Graham Clifford. "By the time the business owners return to the office
on Monday or after a long weekend, the damage has already been done." Unfortunately
for the business owners in Perth, their companies had "extremely vulnerable"
VoIP networks that used only the "most basic security," including
factory-default access codes and passwords.
Criminals who wage VoIP attacks
like the one in Australia operate internationally and target those business
phone systems that are most vulnerable. Over the course of a weekend, they may
place thousands of calls to numbers they own, thus making a tidy profit.
According to Richard Stephens, a managing partner at Neural Networks who has
fended off VoIP attacks, stopping the bad guys begins with enforcing passwords
and prefixes that aren't easy to guess. Stephens also recommends defensive tactics
such as limiting the number of calls that can be made, blocking phone calls to
countries that aren't normally contacted, and developing intelligent systems to
detect anomalous behavior.
What else should you do to
protect your VoIP network?
Source: ZDNet Australia
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Re: How Safe is Your VoIP Network?
