Cisco 7961G - IP Phone VoIP Administration Manual page 46

Understanding Security Features for Cisco Unified IP Phones
Note
Table 1-3 Overview of Security Features
Feature
Image authentication
Customer-site certificate instal-
lation
Device authentication
File authentication
Signaling Authentication
Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE Administration Guide for Cisco Unified CallManager
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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 CallManager Security Guide.
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 CallManager Administration that a certificate be installed
by using the CAPF
Security Configuration menu on the phone. See the
Security on the Cisco Unified IP Phone" section on page 3-19
more information.
Occurs between the Cisco Unified CallManager 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 CallManager should occur, and, if necessary, creates
a secure signaling path between the entities using TLS protocol.
Cisco Unified CallManager will not register phones unless they can
be authenticated by the Cisco Unified CallManager.
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.
Chapter 1 An Overview of the Cisco Unified IP Phone
1
. Alternatively, you can install an LSC from the
"Configuring
for
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