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Chapter 7
Monitoring the Cisco Unified IP Phones Remotely
Table 7-5
Streaming Statistics Area Items (continued)
Item
Max Conceal Ratio
Conceal Secs
Severely Conceal Secs
1
Latency
Max Jitter
Sender Size
Sender Reports Received
Sender Report Time
1
Received
Rcvr Size
Rcvr Discarded
1
Rcvr Reports Received
Rcvr Report Time Received
Voice Quality Metrics
MOS LQK
Avg MOS LQK
Min MOS LQK
Max MOS LQK
MOS LQK Version
Cmltve Conceal Ratio
OL-23091-01
Description
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.
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.
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.
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
Monitoring the Voice Quality of Calls, page
The MOS LQK score can vary based on the type of codec that the Cisco Unified IP Phone
uses.
Average MOS LQK score observed for the entire voice stream.
Lowest MOS LQK score observed from start of the voice stream.
Baseline or highest MOS LQK score observed from start of the voice stream.
These codecs for the Cisco Unified IP Phones 7962G and 7942G provide the following
maximum MOS LQK score under normal conditions with no frame loss:
G.711 gives 4.5
•
G.722 gives 4.5
•
G.728/iLBC gives 3.9
•
G.729 A/AB gives 3.8
•
These codecs for the Cisco Unified IP Phones 7961G/G-GE and 7941G/G-GE provide the
following maximum MOS LQK score under normal conditions with no frame loss:
G.711 gives 4.5
•
G.729 A /AB gives 3.7
•
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.
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
Streaming Statistics
9-15.
7-13
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Troubleshooting
