Securing VoIP Networks: Threats, Vulnerabilities, and Countermeasures (Repost)

Communication between people has changed with the invention of the telephone. The ability to communicate across continents in real-time has also helped our society in several dimensions including entertainment, trade, finance, and defense. But this new capability did not come without an investment. Building an international telephony infrastructure has required the cooperation of both commercial and government organizations to evolve into what it is today. It has also led to the formation of international standard bodies that both direct and support the industry towards an interoperable communication networks.