IP Phone User Manual

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding the Phone Startup Process
2-12
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
OL-11524-01
7. Requesting the
Configuration File.
The TFTP server has configuration files, which
define parameters for connecting to Cisco
Unified CallManager and other information for
the phone.
• Understanding
Phone
Configuration
Files, page 2-8
• Resolving Startup
Problems,
page 9-2.
8. Contacting Cisco
Unified CallManager.
The configuration file defines how the Cisco
Unified IP Phone communicates with Cisco
Unified CallManager 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 CallManager on
the list. If security is implemented, the phone
makes a TLS connection. Otherwise, it makes a
non-secure TCP connection.
If the phone was manually added to the database,
Cisco Unified CallManager identifies the phone.
If the phone was not manually added to the
database and auto-registration is enabled in Cisco
Unified CallManager, the phone attempts to
auto-register itself in the Cisco
Unified CallManager database.
Note Auto-registration is disabled when
security is enabled on Cisco
Unified CallManager. In this case, the
phone must be manually added to the
Cisco Unified CallManager database.
Resolving Startup
Problems, page 9-2.
Table 2-4 Cisco Unified IP Phone Startup Process (continued)
Step Description Related Topics