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Test Shows VoIP Call Quality Can improve With SSL VPN Links

Feb 20, 2006 | Inside: Technologies

VoIP is often written off as an application that will not work well over an SSL VPN link. To test that argument, we examined 10 SSL VPN products in four network scenarios to see how well VoIP calls were handled by the products’ network extension clients.

The news is generally good. In high-bandwidth, low-latency environments, there is virtually no difference in quality between an unencrypted VoIP call and the same call made over an SSL VPN (see chart). Even better news is our discovery that a VoIP call made over SSL VPN on a typical broadband Internet connection is of higher quality than an unencrypted call. The only bad news comes with truly awful network connections: ones with high loss and limited bandwidth.

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