Toll fraud and security gaps that can lead to it

With recent reports [1] of toll fraud showing how expensive these breeches can be, it's worth taking a look at vulnerabilities in voice networks to protect against unauthorized usage. A recent report from Sipera's Satyam Tyagi, director of technical marketing, outlines some of the ways hackers can exploit networks though gaps in session border controllers and media gateways to run up outrageous long distane bills at a company's expense. Tyagi's analysis of the most common ways toll fraud can occur can be found here. [2]