Description
Feature
The Cisco Unified IP Phone can use 802.1X authentication to request
and gain access to the network. See the
802.1X authentication, on page
13
for more information.
802.1X Authentication
Voice Quality Metrics
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.
The MOS LQK score can vary based on the type of codec that
the Cisco Unified IP Phone uses.
Note
MOS LQK
Average MOS LQK score for the entire voice stream.
Avg MOS LQK
Lowest MOS LQK score from the start of the voice stream.
Min MOS LQK
Baseline or highest MOS LQK score from the start of the voice stream.
The following codecs provide the corresponding maximum MOS LQK
scores under normal conditions with no frame loss:
•
G.711: 4.5
•
G.728: 3.9
•
G729A/AB: 3.7
Max MOS LQK
Version of the Cisco-proprietary algorithm used to calculate the MOS
LQK scores.
MOS LQK Version
802.1X authentication
The Cisco Unified IP Phones support 802.1X authentication.
Overview
Cisco Unified IP Phones and Cisco Catalyst switches traditionally use Cisco Discovery Protocol (CDP) to
identify each other and determine parameters such as VLAN allocation and inline power requirements. CDP
does not identify locally attached workstations. Cisco Unified IP Phones provide an EAPOL pass-through
mechanism. This mechanism allows a workstation attached to the Cisco Unified IP Phone to pass EAPOL
messages to the 802.1X authenticator at the LAN switch. The pass-through mechanism ensures that the IP
phone does not act as the LAN switch to authenticate a data endpoint before accessing the network.
Cisco Unified IP Phones also provide a proxy EAPOL Logoff mechanism. In the event that the locally attached
PC disconnects from the IP phone, the LAN switch does not see the physical link fail, because the link between
the LAN switch and the IP phone is maintained. To avoid compromising network integrity, the IP phone sends
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
13
Cisco Unified IP Phone
802.1X authentication