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Providing QoS for VoIP Traffic Overview
The SPDF supports quality-of-service (QoS) functionality that you can apply for different levels of quality to different types of media. For example, you can configure one set of QoS parameters for a video stream and a different set of parameters for a voice stream. With this feature, you can divide your network into segments and allocate resources to those segments according to your company’s business model. For example, customers who pay more can get more bandwidth or faster bandwidth.
To prevent filling a link to capacity or overfilling a link, which can result in network congestion and poor performance, you can limit media streams to specific bandwidth by specifying a committed information rate and a committed burst size.
Also, you can use DSCP marking to indicate the recommended priority of a media stream to the routers and switches that the media is heading towards.
The SPDF uses service classes to determine system resources. The selection of a service class for a specific stream is based on SIP signaling parameters. A service class has one or more terms that determine whether media of a specific type is allowed, and if it is, the bandwidth restrictions that must be set on packets, as well as their priority. After you create your service classes, you apply them using new call usage policies.
