Cisco 7962G Administration Guide - Page 41

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network Understanding Phone Configuration Files Obtaining Additional Information about Power For related information about power, refer to the documents shown in Table 2-2. These documents provide information about the following topics: • Cisco switches that work with the Cisco Unified IP Phone 7962G and 7942G • The Cisco IOS releases that support bidirectional power negotiation • Other requirements and restrictions regarding power Table 2-2 Related Documentation for Power Document Topics URL Cisco Unified IP Phone Power http://http://www.cisco.com/en/US/products/ps6951/index.html Injector PoE Solutions http://www.cisco.com/en/US/netsol/ns340/ns394/ns147/ns412/net working_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 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 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 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 Administration. 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 will continuously try to obtain a CTL file, so that 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 OL-14625-01 Cisco Unified IP Phone 7962G and 7942G Administration Guide for Cisco Unified Communications Manager 6.1 2-5