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Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0
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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
Cleaning the Cisco Unified IP Phone
To clean your Cisco Unified IP phone, use a soft, dry cloth to wipe the phone and the touchscreen. Do
not apply liquids or powders directly on the phone. As with all non-weather-proof electronics, liquids
and powders can damage the components and cause failures.
Disable the touchscreen before cleaning it so that you will not inadvertently choose a feature from the
pressure of the cleaning cloth. To disable the touchscreen so that it will not respond to touch, press the
Display button for more than one second. The phone displays Touchscreen Disabled and the Display
button flashes green.
After one minute, the touchscreen automatically re-enables itself. To re-enable the touchscreen before
that, press the flashing Display button for more than one second. The phone displays Touchscreen
Enabled.
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 mobile network or calling card network.
• Acoustic problems coming from a speakerphone, handsfree
mobile 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