3Com WX3000 operation manual Voice Vlan Configuration, Voice Vlan Overview, How an IP Phone Works

1 Voice VLAN Configuration

The sample output information in this manual was created on the WX3024. The output information on your device may vary.

Voice VLAN Overview

Voice VLANs are VLANs configured specially for voice traffic. By adding the ports connected with voice devices to voice VLANs, you can have voice traffic transmitted within voice VLANs and perform QoS-related configuration for voice traffic as required, thus ensuring the transmission priority of voice traffic and 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. Normally, an IP telephone automatically acquires an IP address from a DHCP server in its network.

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:

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IP address of the network call processor (NCP) IP address of the secondary NCP server Voice VLAN configuration

Failover call routing

The following contents just describe the IP address acquiring process of IP phones in general. Different IP phones may work differently. Refer to the IP Phones User Manual for details.

Following describes the way an IP phone acquires an IP address.

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