Cisco 7975G Software Manual page 213

Model Information, Status, and Statistics
Item
Max Jitter
Rcvr Discarded
Rcvr Lost Packets
Voice Quality Metrics
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
Description
Maximum jitter observed since the receiving voice stream opened.
Number of RTP packets in the receiving voice stream that have been
discarded (such as bad packets or packets received too late).
The phone discards payload type 19 comfort noise packets that by
Note
Cisco Gateways generate, which increment this counter.
Missing RTP packets (lost in transit).
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
Quality Monitoring, on page
The MOS LQK score can vary based on the type of codec that the
Note
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).
Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G Administration Guide for Cisco Unified
Call Statistics Screen
237.
Communications Manager 9.0 (SCCP and SIP)
Voice
193