Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding the Phone Startup Process
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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 4.2, Cisco Unified IP Phones
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• Data traffic present on the data/native VLAN may reduce the quality of
Voice-over-IP traffic.
• Network security may indicate a need to isolate 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 is connected 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 VLAN)
Isolating the phones on a separate, auxiliary VLAN improves the quality of the
voice traffic and allows a large number of phones to be added to an existing
network where 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 related documentation at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/lan/index.htm
Related Topics
• Understanding the Phone Startup Process, page 2-7
• Network Configuration Menu Options, page 4-3
Providing Power to the Cisco Unified IP Phone
You can power a Cisco Unified IP Phone from an external power supply, from a
switch port, or from a power source between the phone and the switch.
The Cisco Unified IP Phone can be powered by the following sources:
• External power source—Optional Cisco AC adapter and power cord for
connecting to a standard wall receptacle.
• WS-X6348-RJ45V 10/100 switching module—Inline power provider to the
Cisco Unified IP Phone when connected to a Catalyst 6000 family
10/100BaseTX switching module.
