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Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 6.0
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Chapter 9 Troubleshooting and Maintenance
Using the Quality Report Tool
Using the 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 the
Cisco Unified Communications Manager installation.
You can configure Cisco Unified IP Phones with QRT. When you do so, users can
report problems with phone calls by pressing the QRT softkey. This softkey is
available only when the Cisco Unified IP Phone is in the Connected, Connected
Conference, Connected Transfer, and/or OnHook states.
When a user presses the QRT softkey, a list of problem categories appears. The
user selects the appropriate problem category and this feedback is logged in an
XML file. Actual information logged depends on the user selection and whether
the destination device is a Cisco Unified IP Phone.
For more information about using QRT, refer to Cisco Unified Communications
Manager Serviceability Administration Guide and
Cisco Unified Communications Manager Serviceability System Guide.
Monitoring the Voice Quality of Calls
To measure the voice quality of calls that are sent and received within the network,
Cisco Unified IP Phones use these 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.
• MOS-LQK metrics—Use a numeric score to estimate the relative voice
listening quality. The Cisco Unified IP Phone calculates the mean opinion
score (MOS) for listening quality (LQK) based audible concealment events
due to frame loss in the preceding 8 seconds, and includes perceptual
weighting factors such as codec type and frame size.
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