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Cisco Unified IP Phone 7970G/7971G-GE for Cisco Unified Communications Manager 6.0
OL-12232-01
Chapter 9 Troubleshooting and Maintenance
Where to Go for More Troubleshooting Information
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_series_home.html
Cisco Products and Services (Technical Support and Documentation):
http://www.cisco.com/en/US/products/sw/voicesw/tsd_products_support_
category_home.html
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.
Table 9-5 Changes to Voice Quality Metrics
Metric Change Condition
263


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