Five Nightmares for a Telecom are five stories on how to intrude into an operator’s network and perform an attack against packet services, how to gain control of the infrastructure, make money with VoIP and self-service portals. Some attacks already have precedents in the past, and others are just a fancy, which we hope will not become a reality. Dmitry Kurbatov is an information security specialist at Positive Technologies, the Department for Network Devices Security Analysis of the Positive Research Center.Dmitry Kurbatov Dmitry Kurbatov