Voice Quality Monitoring; Voice Quality Troubleshooting Tips - Cisco 8832 Maintenance Manual

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Voice Quality Monitoring

The ping destination allows only alphanumeric characters, '-', and "_" (underscores). Otherwise the phone

shows an error on the web page. If the <ping destination> includes spaces, the phone uses only the first part

of the address as the pinging destination.

For example, to ping the 192.168.1.1 address:

http://<Phone IP>/admin/ping?192.168.1.1

Voice Quality Monitoring

To measure the voice quality of calls that are sent and received within the network, Cisco 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

• Concealed Second metrics—Show the number of seconds in which the DSP plays 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 IP Phone using the Call Statistics screen or remotely by

using Streaming Statistics.

When you observe significant and persistent changes to metrics, use the following table for general

troubleshooting information.

Table 2: Changes to Voice Quality Metrics

Metric Change

Conceal Ratio and Conceal Seconds increase

significantly

Maintenance

conceal ratio is calculated every 3 seconds.

due to lost frames. A severely "concealed second" is a second in which the DSP plays more than five

percent concealment frames.

Condition

Network impairment from packet loss or high jitter.

Maintenance

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