Cisco 6921 Administration Guide - Page 126
Troubleshooting Tips, Where to Go for More Troubleshooting Information
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Where to Go for More Troubleshooting Information Chapter 9 Troubleshooting and Maintenance 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 7-8) or remotely by using Streaming Statistics (see the Monitoring the Cisco Unified IP Phone Remotely chapter). Troubleshooting Tips When you observe significant and persistent changes to metrics, use Table 9-3 for general troubleshooting information. Table 9-3 Changes to Voice Quality Metrics Metric Change Condition Conceal Ratio and Conceal Network impairment from packet loss or high jitter. Seconds increase significantly Conceal Ratio is near or at zero, • Noise or distortion in the audio channel such as echo or but the voice quality is poor. 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. Note Voice quality metrics do not account for noise or distortion, only frame loss. 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 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 9-12 Cisco Unified IP Phone 6921, 6941, and 6961 Administration Guide for Cisco Unified Communications Manager 7.1 (SCCP) OL-19025-01