Cisco 8961 Administration Manual page 53
Unified communications manager 10.0 sip
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Cisco Unified IP Phone
Feature
Image encryption
Customer site certificate installation
Device authentication
File authentication
File encryption
Signaling authentication
Manufacturing installed certificate
Media encryption
CAPF (Certificate Authority Proxy
Function)
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Description
Encrypted binary files (with the extension .sebn) prevent tampering with the firmware image
before the image 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 certificate installation in Cisco Unified Communications Manager Administration
using the Certificate Authority Proxy Function (CAPF). Alternatively, you can install a
Locally Significant Certificate (LSC) from the Security Configuration menu on the phone.
See
Cisco Unified IP Phone Security, on page 68
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 it can authenticate them.
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.
Encryption prevents sensitive information from being revealed while the file is in transit to
the phone. In addition, 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.
Uses the TLS protocol to validate that no tampering to signaling packets has occurred during
transmission.
Each Cisco Unified IP Phone contains a unique manufacturing installed certificate (MIC),
which is used for device authentication. The MIC provides permanent unique proof of identity
for the phone and allows Cisco Unified Communications Manager to authenticate the phone.
Uses SRTP to ensure that media streams between supported devices prove 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.
Implements parts of the certificate generation procedure that are too processing-intensive
for the phone, and interacts with the phone for key generation and certificate installation.
The CAPF can be configured to request certificates from customer-specified certificate
authorities on behalf of the phone, or it can be configured to generate certificates locally.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 10.0
Supported security features
for more information.
(SIP)
29
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