VoIP VPN
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[edit] Secure Voice Encryption
A VoIP VPN combines Voice over IP and Virtual Private Network technologies to offer a method for delivering secure voice. Because VoIP transmits digitized voice as a stream of data, the VoIP VPN solution accomplishes voice encryption quite simply, applying standard data-encryption mechanisms inherently available in the collection of protocols used to implement a VPN.
The VoIP gateway-router first converts the analog voice signal to digital form, encapsulates the digitized voice within IP packets, then encrypts the digitized voice using IPSec, and finally routes the encrypted voice packets securely through a VPN tunnel. At the remote site, another VoIP router decodes the voice and converts the digital voice to an analog signal for delivery to the phone.
[edit] Other advantages
Security is not the only reason to pass Voice over IP through a Virtual Private Network, however. Session Initiation Protocol, a commonly used VOIP protocol is notoriously difficult to pass through a firewall because it uses of random port numbers to establish connections. A VPN is one solution to avoid a firewall issue when configuring remote VoIP clients. The VPN virtually moves users inside the same network local as the VoIP server.
[edit] Free Implementation
VoIP VPN solution may be accomplished with free Open Source software by using a Linux distribution, or BSD, as an Operating System, a VoIP Server, and an IPsec server.
[edit] VoIP VPN Service
http://www.vpn4voip.com - VPN for VOIP is a low cost SSL based VPN service specially designed for VOIP applications. It helps to bypass ISP blocking on VOIP calls utilizing the VPN tunneling technology and assigns mapped static public IP to VOIP gateways for wholesale traffic origination and termination applications. The service is QoS controlled, secure, flexible and reliable. It is claimed to be working 100% with any ISP - Only one open UDP port is needed to get the solution works. You can use their free deployed client software under Windows XP/2003 with two Ethernet cards which changes the PC into a soft VPN router, or just purchase their affordable standalone VPN4VOIP router. Client side can use any dynamic or private IP connections to use the service.
