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Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
OL-23769-01
Chapter
Streaming Statistics
Max Jitter Maximum value of instantaneous jitter, in milliseconds.
Sender Size RTP packet size, in milliseconds, for the transmitted stream.
Sender Reports Received1Number of times RTCP Sender Reports have been received.
Sender Report Time
Received1Last time at which an RTCP Sender Report was received.
Rcvr Size RTP packet size, in milliseconds, for the received stream.
Rcvr Discarded RTP packets received from network but discarded from jitter buffers.
Rcvr Reports Received1Number of times RTCP Receiver Reports have been received.
Rcvr Report Time Received1Last time at which an RTCP Receiver Report was received.
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.
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