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Phone Configuration Files
Phone Configuration Files
The TFTP server stores the phone configuration files that define Cisco Unified Communications Manager
connection parameters. In general, any time you make a change in Cisco Unified Communications Manager
that requires the phone to be reset, a change is automatically made to the phone configuration file.
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.
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 Communications Manager, the phone establishes a TLS
connection to Cisco Unified Communications Manager. Otherwise, the phone establishes a TCP connection.
If the device security mode in the configuration file is set to Authenticated or Encrypted, but the phone
Note
has not received a CTL file, the phone tries four times to obtain a CTL file so it can register securely.
If you configure security-related settings in Cisco Unified Communications Manager, the phone configuration
file contains sensitive information. To ensure the privacy of a configuration file, you must configure it for
encryption. For detailed information, see the " Configuring Encrypted Phone Configuration Files" chapter in
Cisco Unified Communications Manager Security Guide. A phone requests a configuration file whenever it
resets and registers with Cisco Unified Communications Manager.
A phone accesses a default configuration file named XmlDefault.cnf.xml from the TFTP server when the
following conditions exist:
• You have enabled autoregistration in Cisco Unified Communications Manager
• The phone has not been added to the Cisco Unified Communications Manager database
• The phone is registering for the first time
If autoregistration is not enabled and the phone is not added to the Cisco Unified Communications Manager
database, the system rejects the phone registration request.
If the phone registers and works in encrypted mode, the phone accesses the configuration file named
SEPmac_address.cnf.xml.enc.sgn. If the SEPmac_address.cnf.xml.enc.sgn does not exist on the TFTP server,
the phone requests the file SEPmac_address.cnf.xml.sgn. That is, if the phone works in encrypted mode with
TFTP Encrypted Config selected, the phone accesses the configuration file named
SEPMac_addr.cnf.xml.enc.sgn. If the phone works in encrypted mode with TFTP Encrypted Config not
selected, the phone accesses the file SEPMac_addr.cnf.xml.sgn. To enable TFTP Encrypted Configuration,
select the TFTP Encrypted Config check box in the Phone Security Profile Configuration page. You can
access this page from the Cisco Unified Communications Manager by selecting System > Security > Phone
Security Profile and clicking Add New.
For SIP phones, the TFTP server generates these SIP configuration files:
• SIP IP Phone:
Cisco Unified IP Phone 6901 and 6911 Administration Guide for Cisco Unified Communications Manager 10.0
(SCCP and SIP)
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◦ For unsigned and unencrypted files - SEP<mac>.cnf.xml
◦ For signed files - SEP<mac>.cnf.xml.sgn
◦ For signed and encrypted files - SEP<mac>.cnf.xml.enc.sgn
Cisco Unified IP Phone and Telephony Networks