Hear the difference vs. QoS:

Degraded VoIP call using QoS*


Clear VoIP call using Tenarys*


*Calls were recorded over a 1.54 Mbit T1 Internet connection with traffic of 4 VoIP calls and 50 concurrent inbound http sessions, with limits set at 1400Kbps. Note that Firefox allows up to 30 concurrent http sessions by default.


Why Inbound Traffic Limiting isn't all That Good at Linux.com discusses the limitations of the queuing mechanism used by QoS.

 
For a fraction of the cost of doubling your Internet bandwidth —
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Tenarys downloadable bandwidth management apps for Untangle's® open source network gateway, protect the bandwidth needed for your important Internet-based applications from competing bandwidth-hogging applications.

Many businesses add bandwidth to solve their Internet performance problems only to discover that they've given more room to bandwidth hogs. By prioritizing and protecting important business traffic, Tenarys ensures that you get the most out of your Internet investments.