Phil Zimmerman, best known for his PGP (Pretty Good Privacy) open source tools, has been working on his new Zfone secure VoIP soft client plugin. The Zfone is designed to protect users from the kind of VoIP security issues that are starting to crop up, including vishing.

It should be noted that the Zfone is not a soft client, despite what I said previously. Instead, it's more of a plugin for clients that are "standards compliant". A beta version of Zfone is available now.

Sources: The Inquirer.