Security over VoIP

Virtual Private Network (VPN) is similar to a wide area network (WAN) with a securely encrypted tunnel, authentication and access control technologies, but it is able to use public networks like the internet rather than expensive, private leased lines.

Any voice packets without encryption that are floating in the internet cloud will be put into risk. The below diagram shows that all voice packets going into the internet cloud are encrypted through the VPN tunnel by deploying a VPN router.