Description
Item
Maximum jitter observed since the receiving voice stream opened.
Max Jitter
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
Cisco Gateways generate, which increment this counter.
Note
Rcvr Discarded
Missing RTP packets (lost in transit).
Rcvr Lost Packets
Voice Quality Metrics
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
Voice
Quality Monitoring, on page 237
.
The MOS LQK score can vary based on the type of codec that the
Cisco Unified IP Phone uses.
Note
MOS LQK
Average MOS LQK score observed for the entire voice stream.
Avg MOS LQK
Lowest MOS LQK score observed from start of the voice stream.
Min 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.722 gives 4.5.
•
G.728/iLBC gives 3.9.
•
G.729 A/AB gives 3.8.
Max MOS LQK
Version of the Cisco proprietary algorithm used to calculate MOS LQK
scores.
MOS LQK Version
Total number of concealment frames divided by total number of speech
frames received from start of the voice stream.
Cumulative 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.
Interval Conceal Ratio
Highest interval concealment ratio from start of the voice stream.
Max Conceal Ratio
Number of seconds that have concealment events (lost frames) from the
start of the voice stream (includes severely concealed seconds).
Conceal Secs
Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G Administration Guide for Cisco Unified
Communications Manager 9.0 (SCCP and SIP)
193
Model Information, Status, and Statistics
Call Statistics Screen