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Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP and SIP)
OL-15790-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding Phone Configuration Files
Power Outage
Your accessibility to emergency service through the phone is dependent on the phone being powered. If
there is an interruption in the power supply, Service and Emergency Calling Service dialing will not
function until power is restored. In the case of a power failure or disruption, you may need to reset or
reconfigure equipment before using the Service or Emergency Calling Service dialing.
Obtaining Additional Information about Power
For related information about power, refer to the documents shown in
Table 2-3
. These documents
provide information about these topics:
•
Cisco switches that work with the Cisco Unified IP Phone 7975G
•
The Cisco IOS releases that support bidirectional power negotiation
•
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 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.)
Table 2-3
Related Documentation for Power
Document Topics
URL
Cisco Unified IP Phone Power Injector
http://http://www.cisco.com/en/US/products/ps69
51/index.html
PoE Solutions
http://www.cisco.com/en/US/netsol/
ns340/ns394/ns147/ns412/networking_solutions_
package.html
Cisco Catalyst Switches
http://cisco.com/en/US/products/hw/switches/ind
ex.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/iosswre
l/products_ios_cisco_ios_software_category_ho
me.html