Operation Manual

1-11
Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 6.1
OL-14640-01
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 Phone 7975G 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, look at the Security Configuration menus on
the phone (choose Settings > Security Configuration and choose Settings > Device Configuration >
Security Configuration). For more information, see
Chapter 4, “Configuring Settings on the Cisco
Unified IP Phone.”
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.
Ta b l e 1-3 Overview of Security Features
Feature Description
Image authentication Signed binary files (with the extension .sgn) 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.
Customer-site certificate installation 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 Certificate Authority
Proxy Function (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 3-13 for more information.
Device authentication 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 by using TLS protocol. Cisco
Unified Communications Manager does
not register phones unless they can be authenticated by the
Cisco
Unified Communications Manager.
File authentication 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.
Signaling Authentication Uses the TLS protocol to validate that no tampering has occurred to signaling
packets during transmission.
Manufacturing installed certificate 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.