Cisco 8831 Administration Manual page 79

Appendix A Cisco Unified IP Conference Phone 8831 for Third-Party Call Control Field Reference
Parameter
MOS-LQK
AVG MOS LQK
Min MOS LQK
Max MOS LQK
MOS LQK Version
Cumulative Conceal Ratio
Interval Conceal Ratio
Max Conceal Ratio
Conceal Secs:
Severely Conceal Secs
Latency
Max Jitter
Rcvr Discarded
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.
The MOS LQK score can vary based on the type of
Note
codec that the Cisco Unified IP Conference Phone 8831
for Third-Party Call Control 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.729 A /AB gives 3.7
•
iLBC gives 3.9
•
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.
Number of milliseconds for latency.
Number of milliseconds for receiver jitter.
Number of RTP packets in the receiving voice stream that have
been discarded (bad packets, too late, and so on).
Note The phone will discard payload type 19 comfort noise
packets that are generated by Cisco Gateways, which
will increment this counter.
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