Cisco 7925G-EX - Manual (Page 15)

8-15
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
Chapter 8 Viewing Security, Device, Model, Status, and Call Statistics Information on the Phone
Viewing the Phone Status Menu
Related Topics
• Viewing the Status Messages, page 8-9
• Viewing Network Statistics, page 8-12
• Viewing Firmware Versions, page 8-16
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
“Monitoring the Voice Quality of Calls” section on
page 10-11 .
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.
CumConcealRatio Total number of concealment frames divided by total number of
speech frames received from start of the voice stream.
IntConcealRatio 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.
MaxConcealRatio Highest interval concealment ratio from start of the voice stream.
Conceal Secs Number of seconds that have concealment events (lost frames) from
the start of the voice stream (includes severely concealed seconds).
SevConcealSecs Number of seconds that have more than 5 percent concealment
events (lost frames) from the start of the voice stream.
Table 8-6 Call Statistics Items (continued)
Item Description