Configure an untagged default VLAN on a tagged port to separate untagged packets originating from a PC from the tagged packets originating from an IP phone.
 
Procedure
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In the Device Physical View tab, select a port.
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In the navigation tree, expand the following folders: .
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Click General.
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Click the VLAN tab.
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Select UntagDefaultVlan.
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In the DefaultVlanId, enter a default VLAN ID.
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Click Apply.
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Click Close.