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1 Voice VLAN Configuration
When configuring voice VLAN, go to these sections for information you are interested in:
z Voice VLAN Overview
z Voice VLAN Configuration
z Displaying and Maintaining Voice VLAN
z Voice VLAN Configuration Example
Voice VLAN Overview
Voice VLANs are allocated specially for voice traffic. After creating a voice VLAN and assigning ports
that connect voice devices to the voice VLAN, you can have voice traffic transmitted in the dedicated
voice VLAN and configure quality of service (QoS) parameters for the voice traffic to improve its
transmission priority and ensure voice quality.
How an IP Phone Works
IP phones can convert analog voice signals into digital signals to enable them to be transmitted in
IP-based networks. Used in conjunction with other voice devices, IP phones can offer large-capacity
and low-cost voice communication solutions. As network devices, IP phones need IP addresses to
operate properly in a network. An IP phone can acquire an IP address automatically or through manual
configuration. The following part describes how an IP phone acquires an IP address automatically.
The following part only describes the common way for an IP phone to acquire an IP address. The
detailed process may vary by manufacture. Refer to the corresponding user manual for the detailed
information.
When an IP phone applies for an IP address from a DHCP server, the IP phone can also apply for the
following extensive information from the DHCP server through the Option184 field:
z IP address of the network call processor (NCP)
z IP address of the secondary NCP server
z Voice VLAN configuration
z Failover call routing
Following describes the way an IP phone acquires an IP address.