Overview

A voice VLAN is used for transmitting voice traffic. When ports that connect to voice devices are assigned to a voice VLAN, the system can configure QoS parameters for voice packets to ensure higher transmission priority and sound voice quality.

Common voice devices include IP phones and integrated access devices (IADs). This chapter uses IP phone as an example.

For an IP phone to access a device, the device must perform the following operations:

• Identify the IP phone in the network and obtain the MAC address of the IP phone.

• Advertise the voice VLAN information to the IP phone.

After receiving the voice VLAN information, the IP phone can perform automatic configuration, so the voice packets sent from the IP phone can be transmitted within the voice VLAN.