Chapter2 Preparing to Install the Cisco Unified IP Phone o n Your Network
Understanding the Phone Startup Process
2-10
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
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Table2-4 Cisco Unified IP Phone Startup Process
Step Description Related Topics
1. Obtaining Power
from the Switch.
If a phone is not using external power, the switch
provides in-line power through the Ethernet cable
attached to the phone.
•Providing Power to
the Phone,
page 2-4.
•Resolving Startup
Problems,
page 9-2.
2. Loading the Stored
Phone Image.
The Cisco Unified IP Phone has non-volatile Flash
memory in which it stores firmware images and
user-defined preferences. At startup, the phone
runs a bootstrap loader that loads a phone image
stored in Flash memory. Using this image, the
phone initializes its software and hardware.
Resolving Startup
Problems, page 9-2.
3. Configuring VLAN. If the Cisco Unified IP Phone is connected to a
Cisco switch, the switch next informs the phone of
the voice VLAN defined on the switch port. The
phone needs to know its VLAN membership
before it can proceed with the Dynamic Host
Configuration Protocol (DHCP) request for an IP
address.
•Network
Configuration
Menu, page 4-7.
•Resolving Startup
Problems,
page 9-2.
4. Obtaining an IP
Address.
If the Cisco Unified IP Phone is using DHCP to
obtain an IP address, the phone queries the DHCP
server to obtain one. If you are not using DHCP in
your network, you must assign static IP addresses
to each phone locally.
•Network
Configuration
Menu, page 4-7.
•Resolving Startup
Problems,
page 9-2.