Since IP telephony (IPT) calls are transmitted as streams of IP packets, they are vulnerable to a number of network-based threats, such as eavesdropping and hijacking attempts. This creates a broad range of service delivery, privacy and regulatory implications for many enterprises. Encrypting call signaling and media streams for all calls will provide a very valuable level of security against call intrusion and disruption attempts.

Call Encryption Techniques for IP Telephony

The two dominant call signaling protocols used in IP telephony implementations, H.323 and Session Initiation Protocol (SIP), are both susceptible to third party attacks when operated in their native modes. However, both protocols have useful signaling and media encryption options available...