Cisco 7971G-GE - IP Phone VoIP Administration Manual page 160

Streaming Statistics
Table 8-5
Item
Max MOS LQK
MOS LQK Version
Cumulative Conceal Ratio
Interval Conceal Ratio
Max Conceal Ratio
Conceal Secs
Severely Conceal Secs
Latency
Max Jitter
Sender Size
Sender Reports Received
Sender Report Time
Received
Rcvr Size
Rcvr Discarded
Rcvr Reports Received
Rcvr Report Time Received
Voice Quality Metrics
MOS LQK
Avg MOS LQK
Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0
8-12
Streaming Statistics Area Items (continued)
Description
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:
•
•
Version of the Cisco proprietary algorithm used to calculate MOS
LQK scores.
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.
1
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.
Maximum value of instantaneous jitter, in milliseconds.
RTP packet size, in milliseconds, for the transmitted stream.
1
Number of times RTCP Sender Reports have been received.
Last time at which an RTCP Sender Report was received.
1
RTP packet size, in milliseconds, for the received stream.
RTP packets received from network but discarded from jitter buffers.
1
Number of times RTCP Receiver Reports have been received.
1
Last time at which an RTCP Receiver Report was received.
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 the
on page
Note
Average MOS LQK score observed for the entire voice stream.
Chapter 8
G.711 gives 4.5
G.729 A /AB gives 3.7
"Monitoring the Voice Quality of Calls" section
9-15.
The MOS LQK score can vary based on the type of codec that
the Cisco Unified IP Phone uses.
Monitoring the Cisco Unified IP Phone Remotely
OL-15299-01