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Cisco Unified IP Phone and Telephony Networks

• The current VLANs might be configured on an IP subnet basis. However, additional IP addresses might

• Data traffic present on the VLAN supporting phones might reduce the quality of VoIP traffic.

• Network security may require isolation of the VLAN voice traffic from the VLAN data traffic.

You can resolve these issues by isolating the voice traffic onto a separate VLAN. The switch port that the

phone connects to would be configured to have separate VLANs for carrying:

• Voice traffic to and from the IP Phone (auxiliary VLAN on the Cisco Catalyst 6000 series, for example)

• Data traffic to and from the PC connected to the switch through the access port of the IP Phone (native

Isolating the phones on a separate, auxiliary VLAN increases the quality of the voice traffic and allows a large

number of phones to be added to an existing network when there are not enough IP addresses for each phone.

For more information, refer to the documentation included with a Cisco switch. You can also access switch

information at this URL:

http://cisco.com/en/US/products/hw/switches/index.html