Cisco 7931G Administration Guide - Page 228
Troubleshooting Tips - wireless headset
UPC - 882658128578
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Monitoring the Voice Quality of Calls Chapter 9 Troubleshooting and Maintenance Troubleshooting Tips When you observe significant and persistent changes to metrics, use Table 9-4 for general troubleshooting information: Table 9-4 Changes to Voice Quality Metrics Metric Change Condition MOS LQK scores decrease significantly Network impairment from packet loss or high jitter: • Average MOS LQK decreases could indicate widespread and uniform impairment. • Individual MOS LQK decreases indicate bursty impairment. Cross-check with Conceal Ratio and Conceal Seconds for evidence of packet loss and jitter. MOS LQK scores decrease significantly • Check to see if the phone is using a different codec than expected (RxType and TxType). • Check to see if the MOS LQK version changed after a firmware upgrade. Conceal Ratio and Conceal Seconds increase significantly • Network impairment from packet loss or high jitter. Conceal Ratio is near or at zero, but the voice quality is poor • 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. 9-24 Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 6.0 OL-12457-01