With increasing business and consumer adoption of internet telephony (more commonly called voice over internet protocol or VoIP) and recent revelations regarding the NSAâ??s domestic spying program, one begins to wonder - how secure are VoIP calls? In this podcast we discuss the differences between public switched telephone networks (PSTNs) and VoIP, security concerns regarding VoIP traffic, the potential for blocking voice traffic and potential security threats posed by Skype and other VoIP clients.