VoIP several aspects of the ability to optimize the performance of requirements, such as the voice business very flexible classification ability, ability to ensure minimum bandwidth setting, to other business classes on the network's ability to provide a good QoS guarantee, and the ability to provide genuine business support, in the enterprise application based on IP technology of telephone technology, VoIP VLAN is an ideal way of IP phone VLAN should be a VLAN tag, and a specific used for VoIP 802.1 Q VLAN ID, if VoIP and desktop PC share the switch port, this particular port must also is a VLAN member adapted to PC,
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