Cisco 7965G Administration Manual page 26

Understanding Security Features for Cisco Unified IP Phones
Table 1-3 Overview of Security Features
Feature
Image authentication
Customer-site certificate
installation
Device authentication
File authentication
Signaling Authentication
Manufacturing installed
certificate
Secure SRST reference
(SCCP pohones only)
Media encryption
Signaling encryption
Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.0
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Description
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.
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
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.
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 does not
register phones unless they can be 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.
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.
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.
Uses SRTP to ensure that the media streams between supported
devices proves secure and that only the intended device receives and
reads the data. Includes creating a media master key pair for the
devices, delivering the keys to the devices, and securing the delivery
of the keys while the keys are in transport.
Ensures that all SCCP signaling messages that are sent between the
device and the Cisco Unified Communications Manager server are
encrypted.
Chapter 1 An Overview of the Cisco Unified IP Phone
1
. Alternatively, you can install an
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