It seems that Phil Zimmerman, who gave the world secure email by inventing PGP, is taking a run at serious VOIP encryption. A welcome development in the fast-evolving but still-insecure world of internet telephony.
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There is already a fully encrypted VoIP system available. This system does not us SIP based transport which is the reason the security issue exists to begin with but instead uses the IAX transport within AIX and is fully encrypted at the transport level. No need for third party ad on’s…..see http://www.virttel.com