A VoIP VPN offer a secure voice by combining Voice over IP and Virtual Private Network technologies. Accomplishing voice encryption is very simple in VoIP VPN solution. It uses various standard data-encryption mechanisms for implementing VPN. The analog voice signal is converted into digitized form by the VoIP gateway router.

The VoIP gateway-router first converts the analog voice signal to digital form .Following that, it encapsulates the digitized voice within IP packets. Then the digitized voice is encrypted using IPSec. At last, it routes the encrypted voice packets through a VPN tunnel.

Another VoIP router is used to decode the voice and convert the digital voice into analog signal for delivering to the phone. Apart from security, VoIP wireless security is used for avoiding any possible firewall issues during the configuration of remote VoIP clients. The VPN also similarly moves the users inside the same network local as the VoIP server.

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Whitepapers
Deploying IPsec VPN
Configuring per site QoS
True end- to- end service

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