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Chapter 9 Troubleshooting and Maintenance
Monitoring the Voice Quality of Calls
9-26
Cisco Unified IP Phone 7970G/7971G-GE for Cisco Unified Communications Manager 6.0
OL-12232-01
A Conceal Ratio of zero indicates that the IP network is delivering frames and
packets on time with no loss.
Troubleshooting Tips
When you observe significant and persistent changes to metrics, use Table 9-5 for
general troubleshooting information:
Table 9-5 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.
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