Cisco CP-7940G-CH1 Administration Guide - Page 21

Chapter 1 An Overview of the Cisco Unified IP Phone Understanding Security Features for Cisco Unified IP Phones Overview of Supported Security Features Table 1-3 provides an overview of the security features that the Cisco Unified IP Phones support. For more information about these features and about Cisco Unified Communications Manager and Cisco Unified IP Phone security, refer to Cisco Unified Communications Manager Security Guide. For information about current security settings on a phone, choose Settings > Security Configuration. For more information, see the "Security Configuration Menu" section on page 6-12. Note Most security features are available only if a certificate trust list (CTL) is installed on the phone. For more information about the CTL, refer to "Configuring the Cisco CTL Client" chapter in Cisco Unified Communications Manager Security Guide. Table 1-3 Overview of Security Features Feature Image authentication Customer-site certificate installation Device authentication File authentication Signaling Authentication Manufacturing installed certificate Secure SRST reference Description Signed binary files (with the extension .sbn) prevent tampering with the firmware image before it is loaded on a phone. Tampering with the image causes a phone to fail the authentication process and reject the new image. Each Cisco Unified IP Phone requires a unique certificate for device authentication. Phones include a manufacturing installed certificate (MIC), but for additional security, you can specify in Cisco Unified Communications Manager Administration that a certificate be installed by using the CAPF. Alternatively, you can install an LSC from the Security Configuration menu on the phone. See the "Configuring Security on the Cisco Unified IP Phone" section on page 3-10 for more information. Occurs between the Cisco Unified Communications Manager server and the phone when each entity accepts the certificate of the other entity. Determines whether a secure connection between the phone and a Cisco Unified Communications Manager should occur, and, if necessary, creates a secure signaling path between the entities using TLS protocol. Cisco Unified Communications Manager will not register phones unless they can be authenticated by the Cisco Unified Communications Manager. Validates digitally-signed files that the phone downloads. The phone validates the signature to make sure that file tampering did not occur after the file creation. Files that fail authentication are not written to Flash memory on the phone. The phone rejects such files without further processing. Uses the TLS protocol to validate that no tampering has occurred to signaling packets during transmission. Each Cisco Unified IP Phone contains a unique manufacturing installed certificate (MIC), which is used for device authentication. The MIC is a permanent unique proof of identity for the phone, and allows Cisco Unified Communications Manager to authenticate the phone. After you configure a SRST reference for security and then reset the dependent devices in Cisco Unified Communications Manager Administration, the TFTP server adds the SRST certificate to the phone cnf.xml file and sends the file to the phone. A secure phone then uses a TLS connection to interact with the SRST-enabled router. OL-15498-01 Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP) 1-9