Cisco Systems OL-12232-01 manual Voice Quality Metrics

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Chapter 8 Monitoring the Cisco Unified IP Phone Remotely

Streaming Statistics

Table 8-5 Streaming Statistics Area Items (continued)

 

 

Item

Description

 

 

 

 

 

 

 

 

Voice Quality Metrics

 

 

 

 

 

 

 

 

 

MOS LQK

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 9-24.

 

 

 

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 observed for the entire voice

 

 

 

stream.

 

 

 

 

 

 

Min MOS LQK

Lowest MOS LQK score observed from start of the

 

 

 

voice stream.

 

 

 

 

 

 

Max MOS LQK

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

 

 

 

 

 

 

MOS LQK Version

Version of the Cisco proprietary algorithm used to

 

 

 

calculate MOS LQK scores.

 

 

 

 

 

 

Cmltve 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.

 

 

 

 

 

 

 

Cisco Unified IP Phone 7970G/7971G-GE for Cisco Unified Communications Manager 6.0

 

 

 

 

OL-12232-01

 

 

8-19

 

 

 

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Contents Monitoring the Cisco Unified IP Phone Remotely Procedure Accessing the Web Page for a PhoneDisabling and Enabling Web Page Access Choose Device Phone Device InformationUDI Network Configuration Monitoring the Cisco Unified IP Phone Remotely Description Description OL-12232-01 Network Statistics Ethernet Information Area Items Description Device Logs Streaming Statistics Description MOS LQK Description Voice Quality Metrics Related Topics