VoIP is an increasingly widespread new technology that allows users to escape the tyranny of big telecom and make phone calls over the Internet. But while VoIP may be cheap and convenient, it's notoriously lacking in security. With little effort, attackers can eavesdrop on conversations, disrupt phone calls, inject content into existing conversations, change caller IDs, and access sensitive information—all without the awareness of the VoIP users making the phone calls.
approaches VoIP security from two angles, explaining VoIP's many security holes to both hackers and administrators. The book raises awareness of the importance of VoIP security, describes potential attacks, explains VoIP's biggest weaknesses, and offers solutions for protecting against potential exposure and attacks. Readers learn how to defend against VoIP attacks as they explore issues with VoIP security and the boundaries of VoIP protocols.