Cisco 7925G Administration Guide - Page 24

Understanding Security Features for Cisco Unified IP Phones Chapter 1 Overview of the Cisco Unified Wireless IP Phone 7925G Overview of Supported Security Features Table 1-3 provides an overview of the security features that the Cisco Unified Wireless IP Phone 7925G supports. 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 > System Configuration > Security. For more information, see the "Viewing Security Information" section on page 8-1. 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 the Cisco Unified Communications Manager Security Guide. Table 1-3 Description of Security Features Feature Image authentication Customer-site certificate installation Device authentication File authentication Signaling Authentication Description Prevents tampering with the firmware image before it is loaded on a phone by using signed binary files (with the extension.sbn). Tampering with the image causes a phone to fail the authentication process and reject the new image. Authenticates each Cisco Unified IP Phone by using a unique certificate. 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 Certificate Authority Proxy Function (CAPF). Alternatively, you can install a locally significant certificate (LSC) from the Security Configuration menu on the phone. See the "Configuring the Security Certificate on the Phone" section on page 5-12 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 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. 1-10 Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1) OL-15984-01