Network Security Guidelines

Encrypt and authenticate signaling traffic. All signaling attacks rely on tampering and forging of signaling messages. Whether for crafting spoofed messages, replaying packets, or simply determining the type of message that a user has issued, the plaintext format greatly helps attackers. Firewalls, gateways, and other such devices are no protection against internal attacks. Another layer of defense is necessary at the protocol level to protect SIP (or H.323) content from tampering, interception, and retransmission. As with data networks, this can be accomplished by deploying strong encryption and authentication mechanisms. Among the possible solutions two particular security technologies are becoming more and more popular in VoIP environments: Transport Layer Security (TLS), for TCP-based traffic only, and IP Security (IPsec).

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The Ultimate Computer Repair Guide

The Ultimate Computer Repair Guide

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