Cisco 7975G Software Manual page 166

Streaming Statistics
Table 8-5
Item
Voice Quality Metrics
MOS LQK
Avg MOS LQK
Min MOS LQK
Max MOS LQK
MOS LQK Version
Cmltve Conceal Ratio
Interval Conceal Ratio
Max Conceal Ratio
Conceal Secs
Severely Conceal Secs
1. When the RTP Control Protocol is disabled, no data generates for this field and thus displays as 0.
Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP and SIP)
8-14
Streaming Statistics Area Items (continued)
Description
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
on page 9-16.
The MOS LQK score can vary based on the type of codec that
Note
the Cisco Unified IP Phone uses.
Average MOS LQK score observed for the entire voice stream.
Lowest MOS LQK score observed from start of the voice stream.
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.722 gives 4.5
•
G.728/iLBC gives 3.9
•
G.729 A/AB gives 3.8
•
Version of the Cisco proprietary algorithm used to calculate MOS
LQK scores.
Total number of concealment frames divided by total number of
speech frames received from start of the voice stream.
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.
Highest interval concealment ratio from start of the voice stream.
Number of seconds that have concealment events (lost frames) from
the start of the voice stream (includes severely concealed seconds).
Number of seconds that have more than 5 percent concealment events
(lost frames) from the start of the voice stream.
Chapter 8 Monitoring the Cisco Unified IP Phone Remotely
"Monitoring the Voice Quality of Calls" section
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