Cisco 7970G Administration Guide - Page 60

Understanding Phone Configuration Files Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network Table 2-3 Related Documentation for Power (continued) Document Topics Cisco Catalyst Switches Integrated Service Routers Cisco IOS Software URL http://www.cisco.com/en/US/products /hw/switches/tsd_products_support_ca tegory_home.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. Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 6.1 2-8 OL-14626-01