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Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.5 (SIP)
OL-20861-01
Chapter 12 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 users’ 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 Features and
Services 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.
Note Concealment ratio and concealment seconds are primary measurements based on frame loss. A Conceal
Ratio of zero indicates that the IP network is delivering frames and packets on time with no loss.
You can access voice quality metrics from the Cisco Unified IP Phone by using the Call Statistics screen
(see the “Call Statistics Screen” section on page 10-11) or remotely by using Streaming Statistics (see
the Monitoring the Cisco Unified IP Phone Remotely chapter).