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Scalable VoIP Mobility by Joseph Epstein

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5.6. Security for 802.11
Security is a broad subject, and there is an entire chapter dedicated to the unique challenges with security for voice mobility later. But any component of voice mobility over Wi-Fi will require some use of 802.11's built-in encryption. Keep in mind that securing the wireless link is not only critical, but may be the only encryption used to prevent eavesdroppers from listening in on sensitive voice calls for many networks.
802.11 security has both a rich and somewhat checkered past. Because of the initial application of 802.11 to the home, and some critical mistakes by some of the original designers, 802.11 started out with inadequate protection for traffic. But thankfully, all Wi-Fi-certified devices today are required ...

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