Cisco 7971G-GE Administration Guide - Page 44

Understanding Phone Configuration Files Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network 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 7970 Series • 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://www.cisco.com/en/US/products/hw/phones/ps379/prod_installati on_guides_list.html http://www.cisco.com/en/US/netsol/ ns340/ns394/ns147/ns412/networking_solutions_package.html http://cisco.com/en/US/products/hw/switches/index.html http://www.cisco.com/en/US/products/hw/routers/index.html http://www.cisco.com/en/US/products/sw/iosswrel/products_ios_cisco_ ios_software_category_home.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.) 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. If you configure security-related settings in Cisco Unified Communications Manager Administration, the phone configuration file will contain sensitive information. To ensure the privacy of a configuration file, you must configure it for encryption. For detailed information, refer to the "Configuring Encrypted Phone Configuration Files" chapter in Cisco Unified Communications Manager Security Guide. Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0 2-6 OL-15299-01