PLANET XGS3-24042 - Manual (Page 239)

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No Voice VLAN is configured by default.
Usage Guide:
Set specified VLAN for Voice VLAN, There can be only one Voice VLAN at the same time. The
voice VLAN can not be applied concurrently with MAC-based VLAN.
Example:
Set VLAN100 to Voice VLAN.
Switch#config
Switch(config)#voice-vlan vlan 100