Cisco 7906G Administration Manual page 71

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Configuration files also contain information about which image load the phone
should be running. If this image load differs from the one currently loaded on a
phone, the phone contacts the TFTP server to request the required load files.
(These files are digitally signed to ensure the authenticity of the files' source.)
In addition, if the device security mode in the configuration file is set to
Authenticated and the CTL file on the phone has a valid certificate for
Cisco Unified CallManager, the phone establishes a TLS connection to
Cisco Unified CallManager. Otherwise, the phone establishes a TCP connection.
If the device security mode in the configuration file is set to Authenticated or
Note
Encrypted but the phone has not received a CTL file, the phone will continuously
try to obtain a CTL file so that it can register securely.
If you configure security-related settings in Cisco Unified CallManager
Administration, the phone configuration file will contain sensitive information.
To ensure the privacy of a configuration file, you must configure it for encryption.
For detailed information, refer to the "Configuring Encrypted Phone
Configuration Files" chapter in Cisco Unified CallManager Security Guide.
A phone requests a configuration file whenever it resets and registers with
Cisco Unified CallManager.
A phone accesses a default configuration file named XmlDefault.cnf.xml from the
TFTP server when these conditions exist:
•
•
•
If auto registration is not enabled and the phone has not been added to the
Cisco Unified CallManager database, the phone registration request will be
rejected. In this case, the phone will reset and attempt to register repeatedly.
If the phone has registered before, the phone will access the configuration file
named SEPmac_address.cnf.xml, where mac_address is the MAC address of the
phone. Cisco Unified CallManager System Guide. For more information about
how the phone interacts with the TFTP server, refer to Cisco Unified CallManager
System Guide, "Cisco TFTP" chapter.
Cisco Unified IP Phone 7906G and 7911G Administration Guide for Cisco Unified CallManager 5.1
OL-11515-01
You have enabled auto-registration in Cisco Unified CallManager
The phone has not been added to the Cisco Unified CallManager database
The phone is registering for the first time
Understanding Phone Configuration Files
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