Most security features are available only if a certificate trust list (CTL) is installed on the phone. For more
information about the CTL, see “Configuring the Cisco CTL Client” chapter in Cisco Unified
Communications Manager Security Guide.
Note
Table 3: Overview of Security Features
DescriptionFeature
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.
Image authentication
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 a Locally
Significant Certificate (LSC) from the Security Configuration menu on the
phone.
Customer-site certificate
installation
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 will not register phones unless they can be
authenticated by the Cisco Unified Communications Manager.
Device authentication
Validates digitally signed files that the phone downloads. The phone validates
the signature to make sure that file tampering did not occur after file creation.
Files that fail authentication are not written to Flash memory on the phone.
The phone rejects such files without further processing.
File authentication
Uses the TLS protocol to validate that no tampering has occurred to signaling
packets during transmission.
Signaling Authentication
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.
Manufacturing installed
certificate
After you configure an 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.
Secure SRST reference
Cisco Unified IP Phone 7941G, 7941G-GE, 7942G, 7961G, 7961G-GE, and 7962G Administration Guide for Cisco Unified
Communications Manager 9.0 (SCCP and SIP)
15
Cisco Unified IP Phone
Supported Security Features
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