Cisco Systems 6901 IP Phones section on page 1-17for more information, Voice Quality Metrics

Chapter 1 An Overview of the Cisco Unified IP Phone

Understanding Security Features for Cisco Unified IP Phones

Table 1-5	Overview of Security Features (continued)
Feature		Description
Secure SRST reference		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 configuration file and sends the file to
		the phone. A secure phone then uses a TLS connection to interact with the
		SRST-enabled router.
		The configuration file is with one of the following extensions:
		•	.cnf.xml
		•	.cnf.xml.sgn
		•	.cnf.xml.enc.sgn
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.
Signaling encryption		Ensures that all SCCP and SIP signaling messages that are sent between the device
		and the Cisco Unified Communications Manager server are encrypted.
CAPF (Certificate Authority Proxy		Implements parts of the certificate generation procedure that are too
Function)		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.
Security profiles		Defines whether the phone is nonsecure, authenticated, encrypted, or protected. See
		the “Understanding Security Profiles” section on page 1-15for more information.
Encrypted configuration files		Lets you ensure the privacy of phone configuration files.
Optional disabling of the web server		You can prevent access to a phone’s web page, which displays a variety of
functionality for a phone		operational statistics for the phone.
Phone hardening		Additional security option, which you control from Cisco Unified Communications
		Manager Administration:
		• Disabling access to web pages for a phone
802.1X Authentication		The Cisco Unified IP Phone can use 802.1X authentication to request and gain
		access to the network. See the “Supporting 802.1X Authentication on Cisco Unified
		IP Phones” section on page 1-17for more information.
Voice Quality Metrics
MOS LQK		Objective estimate of the Mean Opinion Score (MOS) for Listening Quality (LQK)
		that ranks audio quality from 5 (excellent) to 1 (bad). This score is based on
		audible-concealment events due to a frame loss in the preceding 8 seconds of the
		voice stream.
		Note The MOS LQK score can vary based on the type of codec that the
			Cisco Unified IP Phone uses.
Avg MOS LQK		Average MOS LQK score for the entire voice stream.
Min MOS LQK		Lowest MOS LQK score from the start of the voice stream.

	Cisco Unified IP Phone 6901 and 6911 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
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