Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding Phone Configuration Files
2-8
Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 6.1
OL-14626-01
Understanding Phone Configuration Files
Configuration files for a phone are stored on the TFTP server and define
parameters for connecting to Cisco Unified Communications Manager. 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’s
configuration file.
Configuration files also contain information about which image load the phone
should be running. If this image load differs from the one that is 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 file 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 Communications Manager, the phone establishes a TLS connection
to Cisco Unified Communications Manager. Otherwise, the phone establishes a
TCP connection. For SIP phones, a TLS connection requires that the transport
protocol in the phone configuration file be set to TLS, which corresponds to the
transport type in the SIP Security Profile in Cisco Unified Communications
Manager.
Note
If the device security mode in the configuration file is set to Authenticated or
Encrypted, but the phone has not received a CTL file, the phone continuously tries
to obtain a CTL file so it can register securely.
Cisco Catalyst Switches
http://www.cisco.com/en/US/products
/hw/switches/tsd_products_support_ca
tegory_home.html
Integrated Service Routers
http://www.cisco.com/en/US/products
/hw/routers/index.html
Cisco IOS Software
http://www.cisco.com/en/US/products
/sw/iosswrel/products_ios_cisco_ios_
software_category_home.html
Table 2-3
Related Documentation for Power (continued)
Document Topics
URL
Summary of Contents for 7970G - IP Phone VoIP
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