Network World has a great lab test article comparing the call quality performance of several commercial VPN packages with VoIP running over them. They’ve used the tried-and-true Mean Opinion Score rating system (see, system performance does have an impact on user opinion!) to show how VoIP call quality varies from one vendor to the next. NW hasn’t gone as far as employing various QoS standards in their research, but the results are spelled out very clearly, and it bears repeating: latency is the enemy of voice over IP.
February 20, 2006
Considering VoIP-over-VPN?
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