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When you make VOIP phone calls, it may be possible that someone gets the record of it. A few cases have been recorded in the past, as the calls are not fully encrypted. To make your conversation fully secure, which is a necessary demand for people doing their business conversations via VOIP Zfone project has launched a new software.
Zfone is a new secure VoIP phone software product which lets you make encrypted phone calls over the Internet. It lets you whisper in someone's ear from a thousand miles away. Zfone is not a VOIP client, It's like a add-on to your Softphone/SIP software. One has to use his existing softphone only.

They have a software product that lets you turn your existing VoIP client into a secure phone. The current Zfone software runs in the Internet protocol stack on any Windows XP, Mac OS X, or Linux PC, and intercepts and filters all the VoIP packets as they go in and out of the machine, and secures the call on the fly. One can use a variety of different software VoIP clients to make a VoIP call. The Zfone software detects when the call starts, and initiates a cryptographic key agreement between the two parties, and then proceeds to encrypt and decrypt the voice packets on the fly. It has its own little separate GUI, telling the user if the call is secure.

A public beta release of the Zfone software is available for download for Windows XP, Mac OS X, or Linux.