Cisco CP-7975G Administration Guide - Page 54
Purpose, Related Topics, Security by Default, Understanding Phone Configuration Files,
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Understanding the Phone Startup Process Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network Table 2-4 Task 7. 8. 9. Cisco Unified IP Phone Startup Process (continued) Purpose Related Topics Requesting the ITL file. The phone requests the ITL file after it requests the CTL file. The ITL file contains the certificates of the entities that the phone can trust. The certificates are used for authenticating a secure connection with the servers or authenticating a digital signature signed by the servers. Refer to Cisco Unified Communications Manager Security Guide, Security by Default. Requesting the Configuration File. The TFTP server has configuration files, which define parameters for connecting to Cisco Unified Communications Manager and other information for the phone. See Understanding Phone Configuration Files, page 2-7. See Resolving Startup Problems, page 9-1. Contacting Cisco Unified Communications Manager. The configuration file defines how the Cisco Unified IP Phone communicates with Cisco Unified Communications Manager and provides a phone with its load ID. After obtaining the file from the TFTP server, the phone attempts to make a connection to the highest priority Cisco Unified Communications Manager on the list. If the security profile of the phone is configured for secure signaling (encrypted or authenticated), and the Cisco Unified Communications Manager is set to secure mode, the phone makes a TLS connection. Otherwise, it makes a nonsecure TCP connection. See Understanding Phone Configuration Files, page 2-7. See Resolving Startup Problems, page 9-1. If the phone was manually added to the database, Cisco Unified Communications Manager identifies the phone. If the phone was not manually added to the database and auto-registration is enabled in Cisco Unified Communications Manager, the phone attempts to auto-register itself in the Cisco Unified Communications Manager database. Note Auto-registration is disabled when you configure the CTL client. In this case, the phone must be manually added to the Cisco Unified Communications Manager database. 2-10 Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5 OL-23092-01