3com MSR 20-20 참조 매뉴얼

System view

vlan-id: ID of the VLAN to be enabled with the voice VLAN feature, in the range of 
2 to 4,094.

Use the voice vlan command to enable the voice VLAN feature globally.

Use the undo voice vlan enable command to disable the voice VLAN feature 
globally.

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At one particular moment, only one VLAN of a certain device can have the 
voice VLAN feature enabled.

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Ensure that a VLAN exists before enabling its voice VLAN feature and that it is 
not VLAN 1. Otherwise, the configurations will fail.

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If a VLAN to be deleted has the voice VLAN feature enabled, you need to 
disable the voice VLAN feature first before deleting the VLAN.

# Enable the voice VLAN feature on VLAN 2(assuming that VLAN 2 already exists).

<Sysname> system-view

[Sysname] voice vlan 2 enable 

voice vlan aging minutes

System view

minutes: Aging time of a voice VLAN, in the range 5 to 43,200 minutes. This value 
is 1,440 by default.

Use the voice vlan aging command to configure the aging time of a voice 
VLAN.

Use the undo voice vlan aging command to restore the aging time of a voice 
VLAN.

Under automatic mode, the system will decide whether to add a port to a voice 
VLAN based on the source MAC address contained in its inbound voice packets. 
After adding a port to the voice VLAN, the system will start the aging timer at the 
same time. If within the aging time, no voice packets is received from the port, it 
will be removed from the voice VLAN when the aging time expires.