We are hosting a webinar today to cover the Voice and Unified Communications: State of Security Report webinar today at 1:00 CST along with the folks from NoJitter. Here is a link to the webinar registration page:
Here is an article about a malware application that infects Android phones, and sends text messages to premium rate numbers. It should also be possible for an application like this to make calls to premium rate numbers. You could also use an applciation like this to generate call floods.
Here is a link to an article about a man who was sentenced to 7 years, for installing software on PCs and using modems to dial premium rate numbers. Apparently this went on for a long time and generated millions of revenue for the attacker. This is a form of toll fraud/long distance abuse, that could probably go on unnoticed in many enterprises, as long as the attacker didn't get too greedy/generate too many calls.
This is the first time ever that anyone has released a security report that is focused on voice/VoIP/communications. The report describes voice security trends and includes a ton of data from 100's of assessments, that backs up the trends we present.