Understanding the phone startup process – Cisco 7912G User Manual
Page 46
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding the Phone Startup Process
2-4
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SIP), Cisco Unified IP Phones
OL-8131-01
Understanding the Phone Startup Process
When connecting to the VoIP network, the Cisco Unified IP Phone goes through
a standard startup process composed of the steps described in
.
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
Step
Configuration
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).
See the
“Providing Power to the Cisco Unified IP
for details.
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.
•
Understanding the
Phone Startup
Process, page 2-4
•
Providing Power to
the Cisco Unified
IP Phone, page 2-9
•
Resolving Startup
Problems, page 7-2
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.
•
Understanding the
Phone Startup
Process, page 2-4
•