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Cisco Unified IP Phone 8941 and 8945 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
OL-20851-01
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Avg Jitter Estimated average RTP packet jitter (dynamic delay that a packet encounters when
going through the network) observed since the receiving voice stream was opened.
Max Jitter Maximum jitter observed since the receiving voice stream was opened.
Rcvr Discarded 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.
Rcvr Lost Packets Missing RTP packets (lost in transit).
Voice Quality Metrics
Cumulative
Conceal Ratio
Total number of concealment frames divided by total number of speech frames
received from start of the voice stream.
Interval 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.
Max Conceal Ratio 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).
Severely Conceal
Secs
Number of seconds that have more than 5 percent concealment events (lost
frames) from the start of the voice stream.
Latency Estimate of the network latency, expressed in milliseconds. Represents a running
average of the round-trip delay, measured when RTCP receiver report blocks are
received.
MOS LQK Objective estimate of the Mean Opinion Score (MOS) for Listening Quality
(LQK) that ranks audio quality from 5 (excellent) to 1 (bad). This score is based
on audible-concealment events due to a frame loss in the preceding 8 seconds of
the voice stream.
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 for the entire voice stream.
Min MOS LQK Lowest MOS LQK score from the start of the voice stream.
Max MOS LQK Baseline or highest MOS LQK score from the start of the voice stream.
The following codecs provide the corresponding maximum MOS LQK scores
under normal conditions with no frame loss:
• G.711: 4.5
• G.722: 4.5
• G.728/iLBC: 3.9
• G729A/AB: 3.7
MOS LQK Version Version of the Cisco-proprietary algorithm used to calculate the MOS LQK
scores.
Table 7-4 Call Statistics Items for the Cisco Unified Phone 8941 and 8945
Item Description