
Chapter 20: Three-port switch and VLAN
functionality
System overview
The Full VLAN support feature can create the IP
Deskphone Voice VLAN and PC Data VLAN
on the three-port switch manually and automatically (see
Figure 26: Voice-VLAN and Data
VLAN on page 172).
If both the Data and the Voice VLAN are enabled on a three-port switch, only the frames with
Data and Voice VLAN tagged go to the network. The IP Deskphone receives only the frames
with Voice VLAN tagged and sends the frames with Voice VLAN tagged, while the PC or local
networks receive all frame types.
When only Voice VLAN is enabled on the three-port switch, all frame types go to the network;
the IP Deskphone receives only the frames with Voice VLAN tagged and send all frames with
Voice VLAN tagged. The PC or local networks receive all frame types.
SIP Software for Avaya 1200 Series IP Deskphones-Administration November 2012 171
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