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Cisco Unified IP Phone 7970G/7971G-GE for Cisco Unified Communications Manager 6.0
OL-12232-01
Chapter 8 Monitoring the Cisco Unified IP Phone Remotely
Streaming Statistics
Voice Quality Metrics
MOS LQK Score that is an objective estimate of the mean opinion
score (MOS) for listening quality (LQK) that rates
from 5 (excellent) to 1 (bad). This score is based on
audible concealment events due to frame loss in the
preceding 8-second interval of the voice stream. For
more information, see the “Monitoring the Voice
Quality of Calls” section on page 9-24.
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 observed for the entire voice
stream.
Min MOS LQK Lowest MOS LQK score observed from start of the
voice stream.
Max MOS LQK Baseline or highest MOS LQK score observed from
start of the voice stream.
These codecs provide the following maximum MOS
LQK score under normal conditions with no frame
loss:
G.711 gives 4.5
G.729 A /AB gives 3.7
MOS LQK Version Version of the Cisco proprietary algorithm used to
calculate MOS LQK scores.
Cmltve Conceal Ratio Total number of concealment frames divided by total
number of speech frames received from start of the
voice stream.
Interval Conceal Ratio Ratio of concealment frames to speech frames in
preceding 3-second interval of active speech. If using
voice activity detection (VAD), a longer interval might
be required to accumulate 3 seconds of active speech.
Table 8-5 Streaming Statistics Area Items (continued)
Item Description
235


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