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Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP)
OL-15498-01
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 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.
Ta b l e 1-3 Overview of Security Features
Feature Description
Image authentication 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.
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 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.
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 using TLS
protocol. Cisco Unified
Communications Manager will 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.
Secure SRST reference 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.