Here are three presentations on VOIP implementation from the 2006 Emerging Telephony Conference.
Stuart Chesire and Benjamin Kowarsch discuss Zeroconf and Bonjour, which make Asterisk clusters work without asking users to perform complex configuration. Installations of these server clusters could make wifi VOIP in hotels many times easier to deploy.
VOIP has only recently become practical, with the comprehensive rollout of broadband to consumers. Wireless roaming is still a challenge. Matthew Gast examines why VOIP is so hard in 802.11 networks. The trick is making VOIP devices act more like cell phones, making load balancing and roaming easier.
Whenever potentially sensitive conversations are broadcast over the air, encryption is critical. Philip Zimmermann, the creator of PGP encryption, takes a look at the history of public key infrastructures and concludes that the industry needs to move away from centrally managed key servers. He presents his solution to VOIP encryption, including the ability to detect eavesdropping.
Stuart Chesire worked on IBM Token Ring with Madge Networks in the U.K., and is currently a senior scientist with Apple Computer, specializing in internet protocols. He has previously published papers in the areas of wireless networking and mobile IP.
Benjamin Kowarsch is co-founder and managing partner at Sunrise Telephone Systems in Japan. He also co-founded and is managing director of the Cellular Roaming Alliance.
Matthew Gast is director of Consulting Engineering at Trapeze Networks. Prior to Trapeze, he was a member of the business development team at NetScreen, where he worked with strategic partners and alliances. Gast is also an active participant in the Wireless LAN Security Initiative at the Interop Labs (iLabs), where he works with other net workers to deploy cutting-edge wireless LAN security solutions.
Philip Zimmermann is the creator of Pretty Good Privacy (PGP), the most widely used email encryption software in the world. He is also known for his work in VoIP encryption protocols, notably ZRTP and Zfone. In early 1996, Zimmermann founded PGP Inc. That company was acquired by Network Associates in December 1997, and Zimmermann stayed on for three years as a senior fellow. NAI decided to drop the product line, and, in 2002, PGP was acquired from NAI by a new company called PGP Corporation. Zimmermann now serves as a special advisor and consultant to that firm. Zimmermann is also a fellow at the Stanford Law School's Center for Internet and Society.
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