Another growing threat, which received massive attention in the past few years, is toll fraud. Toll fraud was brought to the forefront in 2006 when the FBI charged two men with accessing VoIP networks and "reselling" minutes to unsuspecting customers to the tune of millions of dollars. A successful toll fraud attack lets unauthorized users access VoIP networks to make calls, increasing VoIP costs and traffic. The attackers get free calling, while someone else gets stiffed with the bill. Joglekar said toll fraud is tough to fight, especially on VoIP networks that have little authentication or call analysis in place.