Segregation of Traffic
To ensure the best audio quality, it is highly recommended that administrators separate VoIP traffic from other network traffic by placing voice devices on a VLAN that is dedicated to voice functions. Similarly, users with USB-based devices should connect to a wired network rather than a wireless network. By keeping phone devices on a segregated VLAN, it is easier to layer services such as Quality of Service (QoS) onto the network segment to ensure the best possible voice quality for end users. It also makes it simpler to monitor devices because they are logically grouped at the network level.
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