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GS700TP Smart Switch Software Administration Manual
Configuring Switching Settings 4-21
v1.0, December 2007
Voice VLAN
Voice VLAN allows you to enhance VoIP service by configuring ports to carry IP voice traffic
from IP phones on a specific VLAN. VoIP traffic has a preconfigured OUI prefix in the source
MAC address.
You can configure VLANs on which voice IP traffic is forwarded. Non-VoIP traffic is dropped
from the Voice VLAN in auto Voice VLAN secure mode. Voice VLAN also provides QoS to VoIP,
ensuring that the quality of voice does not deteriorate if the IP traffic is received unevenly. The
system supports one Voice VLAN.
There are two operational modes for IP Phones:
• IP phones are configured with VLAN-mode as enabled, ensuring that tagged packets are used
for all communications.
• If the IP phone’s VLAN-mode is disabled, the phone uses untagged packets. The phone uses
untagged packets while retrieving the initial IP address through DHCP. The phone eventually
uses the Voice VLAN and starts sending tagged packets.
The Voice VLAN menu contains the following options:
• “Basic”
• “Advanced”
Basic
The Voice VLAN Basic menu contains the following options:
• “Properties”
Properties
The Voice VLAN Properties screen contains information about Voice VLAN on the device,
including the ports enabled and included in the Voice VLAN.