Cisco 7961G-GE - IP Phone VoIP Administration Manual page 221

Chapter 8 Monitoring the Cisco Unified IP Phone Remotely
Table 8-5 Streaming Statistics Area Items (continued)
Item
Rcvr Report Time
1
Received
Voice Quality Metrics
MOS LQK
Avg MOS LQK
Min MOS LQK
Max MOS LQK
MOS LQK Version
Cmltve Conceal Ratio
Interval Conceal Ratio Ratio of concealment frames to speech frames in preceding 3-second interval
Max Conceal Ratio
Conceal Secs
Severely Conceal Secs Number of seconds that have more than 5 percent concealment events (lost
1. When the RTP Control Protocol is disabled, no data generates for this field and thus displays as 0.
Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.0
OL-11953-01
Description
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
"Monitoring the Voice Quality of Calls" section on 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 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.
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).
frames) from the start of the voice stream.
Streaming Statistics
9-21.
8-17