Cisco 6941 - Unified IP Phone Slimline VoIP Administration Manual page 139

Chapter
Table 8-5 Streaming Statistics Area Items (continued)
Item
Max Jitter
Sender Size
1
Sender Reports Received
Sender Report Time
1
Received
Rcvr Size
Rcvr Discarded
1
Rcvr Reports Received
Rcvr Report Time Received
Voice Quality Metrics
Cumulative Conceal Ratio
Interval Conceal Ratio
Max Conceal Ratio
Conceal Secs
Severely Conceal Secs
Latency
MOS LQK
Avg MOS LQK
Min MOS LQK
Max MOS LQK
MOS LQK Version
1. When the RTP Control Protocol is disabled, no data generates for this field and thus displays as 0.
Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
OL-23769-01
Description
Maximum value of instantaneous jitter, in milliseconds.
RTP packet size, in milliseconds, for the transmitted stream.
Number of times RTCP Sender Reports have been received.
Last time at which an RTCP Sender Report was received.
RTP packet size, in milliseconds, for the received stream.
RTP packets received from network but discarded from jitter buffers.
Number of times RTCP Receiver Reports have been received.
1
Last time at which an RTCP Receiver Report was received.
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).
Number of seconds that have more than 5 percent concealment events (lost frames) from
the start of the voice stream.
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.
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.
The MOS LQK score can vary based on the type of codec that the
Note
Cisco Unified IP Phone uses.
Average MOS LQK score for the entire voice stream.
Lowest MOS LQK score from the start of the voice stream.
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
•
Version of the Cisco-proprietary algorithm used to calculate the MOS LQK scores.
Streaming Statistics
8-11