Cisco 6921 Administration Manual page 49

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Table 2-3 Cisco Unified IP Phone Startup Process (continued)
Task Purpose
Obtaining an IP Address
4.
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.
5. Accessing a TFTP Server
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 server
Note
to use instead of the one assigned by DHCP.
Requesting the CTL file
6.
The TFTP server stores the certificate trust list (CTL)
file. The CTL file contains the certificates necessary
for establishing a secure connection between the
phone and Cisco Unified CM.
7. Requesting the Configuration File
The TFTP server has configuration files, which define
parameters for connecting to Cisco Unified CM and
other information for the phone.
8. Contacting Cisco Unified CM
The configuration file defines how the Cisco
Unified IP Phone communicates with Cisco
Unified CM and provides a phone with its load ID.
After obtaining the file from the TFTP server, the
phone attempts to make a connection to the highest
priority Cisco Unified CM on the list.
If the phone was manually added to the database,
Cisco Unified CM identifies the phone. If the phone
was not manually added to the database and
auto-registration is enabled in Cisco Unified CM, the
phone attempts to auto-register itself in the Cisco
Unified CM database.
Cisco Unified IP Phone 6921, 6941, and 6961 Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP)
OL-20851-01
Understanding the Phone Startup Process
Related Topics
Network Setup Menu, page
•
Resolving Startup Problems, page
•
• Network Setup Menu, page
• Resolving Startup Problems, page
Refer to the Cisco Unified Communications Manager
Security Guide, "Configuring the Cisco CTL Client"
chapter.
• Adding Phones to the Cisco Unified CM Database,
page 2-8.
• Resolving Startup Problems, page
Resolving Startup Problems, page
4-4.
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4-4.
9-1.
9-1.
9-1.
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