The important thing to remember is that QoS must be configured throughout your network—not just on your router running VoIP—to improve voice network performance. Not all QoS techniques are appropriate for all network routers. Edge routers and backbone routers in your network do not necessarily perform the same operations; the QoS tasks they perform might differ as well. To configure your IP network for real-time voice traffic, you need to consider the functions of both edge and backbone routers in your network and then select the appropriate QoS tool or tools.
In general, edge routers perform the following QoS functions:
- Packet classification
- Admission control
- Bandwidth management
- Queuing
In general, backbone routers perform the following QoS functions:
- High-speed switching and transport
- Congestion management
- Queue management
Scalable QoS solutions require cooperative edge and backbone functions.
Although not mandatory, some QoS tools can be valuable in fine-tuning your network to support real-time voice traffic. To configure your IP network for QoS, perform one or more of the following tasks:
Configure RSVP for Voice
Configure Multilink PPP with Interleaving
Configure RTP Header Compression
Configure Custom Queuing
Configure Weighted Fair Queuing
Each of these tasks is discussed in the following sections.
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