Downstream QoS

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Downstream QoS (see Qos) is a technology innovation that enhances VoIP calls by improving the clarity of incoming voice. When data floods the caller's downstream Internet-access line, Downstream QoS can throttle incoming data to ensure time-sensitive voice traffic gets through promptly to the listener. One notable version of the technology was pioneered by Patton Electronics Co. for their SmartNode brand of VoIP equipment. Other versions can be found in VoIP equipment from Cisco Systems and application software from Packeteer.

Standard Upstream QoS. Upstream QoS improves voice quality for the remote side of a VoIP call by transmitting upstream voice traffic at a higher priority than data. Applying upstream QoS at both ends of the call improves voice quality for both users. Yet upstream QoS still leaves the caller vulnerable to downstream data surges. During large file downloads voice quality may degrade.

Some Internet providers may offer services similar to Downstream QoS as a higher-priced, premium service. VoIP systems that combine upstream and downstream QoS mechanisms, reduce the user's dependence on the service provider while providing local control over total voice quality.