1-11 Voice VLAN ConfigurationWhen configuring voice VLAN, go to these sections for information you are interested in:z Voice VLAN Overviewz Voice VLAN Configurationz Displaying and Maintaining Voice VLANz Voice VLAN Configuration ExampleVoice VLAN OverviewVoice VLANs are allocated specially for voice traffic. After creating a voice VLAN and assigning portsthat connect voice devices to the voice VLAN, you can have voice traffic transmitted in the dedicatedvoice VLAN and configure quality of service (QoS) parameters for the voice traffic to improve itstransmission priority and ensure voice quality.How an IP Phone WorksIP phones can convert analog voice signals into digital signals to enable them to be transmitted inIP-based networks. Used in conjunction with other voice devices, IP phones can offer large-capacityand low-cost voice communication solutions. As network devices, IP phones need IP addresses tooperate properly in a network. An IP phone can acquire an IP address automatically or through manualconfiguration. 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. Thedetailed process may vary by manufacture. Refer to the corresponding user manual for the detailedinformation.When an IP phone applies for an IP address from a DHCP server, the IP phone can also apply for thefollowing 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 serverz Voice VLAN configurationz Failover call routingRefer to DHCP Operation for information about the Option184 field.
