ZyXEL Communications XS3800-28, User Manual, Page: 432 / 789

Chapter 57 VLAN
XS3800-28 User’s Guide
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57.12 Voice VLAN
Voice VLAN is a VLAN that is specifically allocated for voice traffic. It ensures that the sound quality of an
IP phone is preserved from deteriorating when the data traffic on the Switch ports is high. It groups the
voice traffic with defined priority into an assigned VLAN which enables the separation of voice and
data traffic coming onto the Switch port.
The Switch can determine whether a received packet is
• an untagged voice packet when the incoming port is a fixed port for voice VLAN.
• a tagged voice packet when the incoming port and VLAN tag belongs to a voice VLAN.
It then checks the source packet’s MAC address against an OUI list. If a match is found, the packet is
considered as a voice packet.
You can set priority level to the Voice VLAN and add MAC address of IP phones from specific
manufacturers by using its ID from the Organizationally Unique Identifiers (OUI).
Click SWITCHING > VLAN > Voice VLAN Setup to display the configuration screen as shown.
Figure 329 SWITCHING > VLAN > Voice VLAN Setup
The following table describes the fields in the above screen.
Table 210 SWITCHING > VLAN > Voice VLAN Setup
LABEL DESCRIPTION
Voice VLAN Global Setup
Voice VLAN Click the second radio button if you want to enable the Voice VLAN feature. Type a
VLAN ID number in the box next to the radio button that is associated with the Voice
VLAN. You also need to create a static VLAN with the same VID in the
SWITCHING > VLAN
> VLAN Setup > Static VLAN screen, and then connect the IP phone with the specified
OUI MAC address to a port that joins the static VLAN.
Click Disable radio button if you do not want to enable the Voice VLAN feature.
Priority Select the priority level of the voice traffic from 0 to 7. Default setting is 5. The higher the
numeric value you assign, the higher the priority for this voice traffic.