Where To Go For More Troubleshooting Information - Cisco 7941G - Unified IP Phone VoIP Administration Manual

Where to Go for More Troubleshooting Information

Table 9-5 Changes to Voice Quality Metrics
Metric Change
MOS LQK scores
decrease significantly
MOS LQK scores
decrease significantly
Conceal Ratio and
Conceal Seconds
increase significantly
Conceal Ratio is near or
at zero, but the voice
quality is poor.
Note
Where to Go for More Troubleshooting Information
Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.1
9-24
Condition
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.
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.
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.
Voice quality metrics do not account for noise or distortion, only frame loss.
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.
Chapter 9 Troubleshooting and Maintenance
OL-14620-01