• Traffic Class 
Indicates the Voice VLAN traffic class. All traffic on Voice VLAN 
will apply this class. 
• Port Mode 
Indicates the Voice VLAN port mode. When the port mode isn't 
disabled, we must disable MSTP feature before we enable Voice 
VLAN. It can avoid the conflict of ingress filter. Possible port 
modes are:   
Disabled: Disjoin from Voice VLAN.   
Auto: Enable auto detect mode. It detects whether there is VoIP 
phone attached on the specific port and configure the Voice 
VLAN members automatically.   
Forced: Forced join to Voice VLAN. 
• Port Security 
Indicates the Voice VLAN port security mode. When the function 
is enabled, all non-telephone MAC address in Voice VLAN will be 
blocked 10 seconds. Possible port modes are:   
Enabled: Enable Voice VLAN security mode operation.   
Disabled: Disable Voice VLAN security mode operation. 
• Port Discovery 
Protocol 
Indicates the Voice VLAN port discovery protocol. It will only 
work when auto detect mode is enabled. We should enable LLDP 
feature before configuring discovery protocol to "LLDP" or 
"Both". Changing the discovery protocol to "OUI" or "LLDP" will 
restart auto detect process? Possible discovery protocols are:   
OUI: Detect telephony device by OUI address.   
LLDP: Detect telephony device by LLDP.   
Both: Both OUI and LLDP. 
 
Buttons 
: Click to save changes. 
: Click to undo any changes made locally and revert to previously saved values. 
4.9.16 Voice VLAN OUI Table 
Configure VOICE VLAN OUI table on this page. The maximum entry number is 16. Modifying the OUI 
table will restart auto detection of OUI process. The Voice VLAN OUI Table screen in Figure 4-9-19 
appears.