Cisco 7970G Administration Manual page 75

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Table 2-4 Cisco Unified IP Phone Startup Process (continued)
Step
5. Accessing a TFTP
Server.
6. Requesting the CTL
file.
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
OL-11524-01
Description
In addition to assigning an IP address, the DHCP
server directs the Cisco Unified IP Phone to a
TFTP Server. If the phone has a statically-defined
IP address, you must configure the TFTP server
locally on the phone; the phone then contacts the
TFTP server directly.
You can also assign an alternative TFTP
Note
server to use instead of the one assigned
by DHCP.
The TFTP server stores the certificate trust list
(CTL) file. This file contains a list of Cisco
Unified CallManagers and TFTP servers that the
phone is authorized to connect to. It also contains
the certificates necessary for establishing a secure
connection between the phone and Cisco
Unified CallManager.
Understanding the Phone Startup Process
Related Topics
Network
•
Configuration
Menu, page
Resolving Startup
•
Problems,
page 9-2.
For more information,
refer to Cisco
Unified CallManager
Security Guide
4-7.
2-11