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Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.5 (SIP)
OL-20861-01
Chapter 1 An Overview of the Cisco Unified IP Phone
Understanding Security Features for Cisco Unified IP Phones
For information about current security settings on a phone, press and choose Administrator
Settings > Security Setup. For more information, see the “Security Setup Menu” section on page 7-13.
Table 1-6 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.
Image Encryption Encrypted binary files (with the extension .sebn) 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 Certificate Authority Proxy Function (CAPF).
Alternatively, you can install a Locally Significant Certificate (LSC) from the Security
Configuration menu on the phone. See the “Configuring Security on the Cisco Unified
IP Phone” section on page 3-21 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 by
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.
File encryption 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 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.
Media encryption 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.