Cisco 7975G Administration Guide - Page 43

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 Table 2-3 Related Documentation for Power Document Topics Cisco Unified IP Phone Power Injector PoE Solutions Cisco Catalyst Switches Integrated Service Routers Cisco IOS Software URL http://http://www.cisco.com/en/US/products/ps69 51/index.html http://www.cisco.com/en/US/netsol/ ns340/ns394/ns147/ns412/networking_solutions_ package.html http://www.cisco.com/univercd/cc/td/ doc/product/lan/index.htm http://www.cisco.com/en/US/products/hw/routers /index.html http://www.cisco.com/en/US/products/sw/iosswre l/products_ios_cisco_ios_software_category_ho me.html 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.) OL-14640-01 Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 6.1 2-5