Bron: http://wiki.gigaset.com.dedi1478.your-server.de/index.php?title=QOS_VLAN_example_with_Netgear_switches

Voice VLAN allows you to enhance VoIP service by configuring ports to carry IP voice traffic from IP phones on a specific VLAN. Voice VLAN also provides QoS to VoIP, ensuring that the quality of voice does not deteriorate if the IP traffic is received unevenly.

This document describes how you can use Netgear equipment to create VLAN's