Quality Report Tool
The Quality Report Tool (QRT) is a voice quality and general problem-reporting tool for the Cisco Unified
IP Phone. The QRT feature is installed as part of Cisco Unified Communications Manager installation.
You can configure user Cisco Unified IP Phones with QRT. When you do so, users can report problems with
phone calls by pressing Report Quality. This softkey or button is available only when the Cisco Unified IP
Phone is in the Connected, Connected Conference, Connected Transfer, or OnHook states.
When a user presses Report Quality, a list of problem categories appears. The user selects the appropriate
problem category, and this feedback is logged in an XML file. Actual information that is logged depends on
the user selection and whether the destination device is a Cisco Unified IP Phone.
For more information about using QRT, see
Cisco Unified Communications Manager Features and Services
Guide
.
Voice Quality Monitoring
To measure the voice quality of calls that are sent and received within the network, Cisco Unified IP Phones
use the following statistical metrics that are based on concealment events. The DSP plays concealment frames
to mask frame loss in the voice packet stream.
•
Concealment Ratio metrics show the ratio of concealment frames over total speech frames. An interval
conceal ratio is calculated every 3 seconds.
•
Concealed Second metrics show the number of seconds in which the DSP plays concealment frames
due to lost frames. A severely concealed second is a second in which the DSP plays more than five
percent concealment frames.
Concealment ratio and concealment seconds are primary measurements that are based on frame loss. A
Conceal Ratio of zero indicates that the IP network is delivering frames and packets on time with no loss.
Note
You can access voice quality metrics from the Cisco Unified IP Phone by using the Call Statistics screen (see
Display Call Statistics Screen, on page 240
) or remotely by using Streaming Statistics (see
on page 247
).
Voice Quality Troubleshooting Tips
When you observe significant and persistent changes to metrics, use the following table for general
troubleshooting information:
Table 58: Changes to Voice Quality Metrics
Condition
Metric change
Network impairment from packet loss or high jitter.
Conceal Ratio and Conceal
Seconds increase significantly.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 10.0
(SIP)
293
Troubleshooting and Maintenance
Quality Report Tool
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