Cisco 7961G - IP Phone VoIP Administration Manual page 47

Chapter 1 An Overview of the Cisco Unified IP Phone
Table 1-3 Overview of Security Features (continued)
Feature
Manufacturing installed certifi-
cate
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
Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE Administration Guide for Cisco Unified CallManager
OL-11528-01
Understanding Security Features for Cisco Unified IP Phones
Description
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 CallManager to authenticate the phone.
After you configure a SRST reference for security and then reset the
dependent devices in Cisco Unified CallManager 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 con-
nection 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 CallManager server are encrypted.
Implements parts of the certificate generation procedure that are too
processing-intensive for the phone, and it interacts with the phone
for key generation and certificate installation. The CAPF can be
configured to request certificates from customer-specified certifi-
cate authorities on behalf of the phone, or it can be configured to
generate certificates locally.
Defines whether the phone is nonsecure, authenticated, or encrypt-
ed. See the "Understanding Security Profiles" section on page 1-17
for more information.
Lets you ensure the privacy of phone configuration files.
You can prevent access to a phone's web page, which displays a
variety of operational statistics for the phone.
1-15