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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding Phone Configuration Files
2-8
Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.0
OL-11953-01
• Other requirements and restrictions regarding power
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 made to the phone’s configuration
file automatically.
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 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
Table 2-3 Related Documentation for Power
Document Topics URL
Cisco Unified IP Phone
Power Injector
http://www.cisco.com/en/US/products/hw/phones/p
s379/prod_installation_guides_list.html
PoE Solutions http://www.cisco.com/en/US/netsol/
ns340/ns394/ns147/ns412/networking_solutions_
package.html
Cisco Catalyst Switches http://www.cisco.com/en/US/products/hw/switches/
tsd_products_support_category_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