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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Read how to maintain and repair any desktop and laptop computer. This Ebook has articles with photos and videos that show detailed step by step pc repair and maintenance procedures. There are many links to online videos that explain how you can build, maintain, speed up, clean, and repair your computer yourself. Put the money that you were going to pay the PC Tech in your own pocket.