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Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
OL-24567-01
Chapter
Streaming Statistics
Related Topics
• “Configuring Settings on the Cisco Unified IP Phone” chapter
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.
1. When the RTP Control Protocol is disabled, no data generates for this field and thus displays as 0.
Table 8-5 Streaming Statistics Area Items (continued)
Item Description
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