"Australian network companies have told of clients receiving phone bills including $100,000 worth of unauthorised calls placed over compromised VoIP servers. Smaller attacks have netted criminals tens of thousands of dollars worth of calls. A Perth business was hit with a $120,000 bill after hackers exploited its VoIP server to place some 11,000 calls over 46 hours last year. VoIP networks are a cash cow for criminals who can earn money from unscrupulous telecommunications carriers profiting from calls placed over victim's networks or to ramp up calls to premium numbers..." | more
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