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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 4.2, Cisco Unified IP Phones
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding the Phone Startup Process
Understanding the Phone Startup Process
When connecting to the VoIP network, the Cisco Unified IP Phone goes through
a standard startup process that is composed of several steps, as described in
Table 2-1. Depending on your specific network configuration, not all of these
steps may occur on your Cisco Unified IP Phone.
Table 2-1 Cisco Unified IP Phone Startup Process (continued)
Step Description Related Topics
1. Obtaining Power
from the Switch.
You can connect the Cisco Unified IP Phone to a
Cisco Catalyst switch with one of the modules that
provides power to the phone (WS-X6348-RJ45V).
If you use this optional configuration, the phone
receives phantom power and powers up when you
connect the Cisco Unified IP Phone to the switch.
The phone then sends Cisco Discovery Protocol
(CDP) notifications to the switch indicating that it
is ready to receive CDP packets and indicating the
power requirement for the phone. The switch
allocates power and sends it over the network
cable.
• Providing Power to
the Cisco Unified
IP Phone, page 2-4.
• Resolving Startup
Problems,
page 8-2.
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 8-2.
3. Configuring VLAN. If the Cisco Unified IP Phone is connected to a
Cisco Catalyst switch, the switch next informs the
phone of the voice VLAN defined on the switch.
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 Options,
page 4-3.
• Resolving Startup
Problems,
page 8-2.
