Cisco Unified IP Phone 8941 Administration Manual page 85

Feature
Device authentication
File authentication
Signaling Authentication
Manufacturing installed certificate
Secure SRST reference
Media encryption
Signaling encryption
CAPF (Certificate Authority Proxy Function)
Security profiles
Encrypted configuration files
Optional disabling of the web server
functionality for a phone
Description
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 they are 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 and 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 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.
Ensures that all SCCP signaling messages sent between the device and the Cisco
Unified Communications Manager server are encrypted.
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.
Defines whether the phone is nonsecure or encrypted.
Lets you ensure the privacy of phone configuration files.
You can prevent access to a phone web page, which displays a variety of operational
statistics for the phone.
Cisco Unified IP Phone 8941 and 8945 Administration Guide for Cisco Unified Communications Manager 10.0 (SCCP
Supported Security Features
and SIP)
71