Troubleshooting Tips; Where To Go For More Troubleshooting Information - Cisco 6921 Administration Manual

Where to Go for More Troubleshooting Information

Concealment ratio and concealment seconds are primary measurements based on frame loss. A Conceal
Note
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
Monitoring the Cisco Unified IP Phone Remotely

Troubleshooting Tips

When you observe significant and persistent changes to metrics, use
troubleshooting information.
Table 9-3
Metric Change
Conceal Ratio and Conceal
Seconds increase significantly
Conceal Ratio is near or at zero,
but the voice quality is poor.
Voice quality metrics do not account for noise or distortion, only frame loss.
Note
Where to Go for More Troubleshooting Information
If you have additional questions about troubleshooting the Cisco Unified IP Phones, several Cisco.com
web sites can provide you with more tips. Choose from the sites available for your access level.
•
•
Cisco Unified IP Phone 6921, 6941, and 6961 Administration Guide for Cisco Unified Communications Manager 7.1 (SCCP)
9-12
"Call Statistics Screen" section on page
Changes to Voice Quality Metrics
Cisco Unified IP Phone Troubleshooting Resources:
http://www.cisco.com/en/US/products/hw/phones/ps379/tsd_products_support_troubleshoot_and_
alerts.html
Cisco Products and Services (Technical Support and Documentation):
http://www.cisco.com/en/US/products/ps10326/tsd_products_support_series_home.html
7-8) or remotely by using Streaming Statistics (see the
chapter).
Condition
Network impairment from packet loss or high jitter.
Noise or distortion in the audio channel such as echo or
•
audio levels.
Tandem calls that undergo multiple encode/decode such as
•
calls to a cellular network or calling card network.
Acoustic problems coming from a speakerphone,
•
handsfree cellular phone or wireless headset.
Check packet transmit (TxCnt) and packet receive (RxCnt)
counters to verify that voice packets are flowing.
Chapter 9 Troubleshooting and Maintenance
Table 9-3 for general
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