Voice Vlan Configuration; Voice Vlan Overview; How An Ip Phone Works - 3Com 4200G 12-Port Configuration Manual

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Voice VLAN Configuration

When configuring voice VLAN, go to these sections for information you are interested in:

Voice VLAN Overview

Voice VLAN Configuration
Displaying and Maintaining Voice VLAN
Voice VLAN Configuration Example
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 and prioritization 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. 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:
IP address of the network call processor (NCP)
IP address of the secondary NCP server
Voice VLAN configuration
Failover call routing
Following describes the way a typical IP phone acquires an IP address.
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