A voice VLAN is assigned to voice data flows. You can create a voice VLAN and add the interface connected to a voice device to the voice VLAN. Then voice data flows can be transmitted on the voice VLAN. The S2700SI or S2710SI-52P switches do not support the voice VLAN function.
By configuring a voice VLAN, you can set quality of service (QoS) parameters for voice data flows to increase the priority of the voice service and improve the quality of calls.