Condition
Metric change
•
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 to a calling card network.
•
Acoustic problems that come 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.
Conceal Ratio is near or at zero,
but the voice quality is poor.
Voice quality metrics do not account for noise or distortion; they account only for frame loss.
Note
Cisco Unified IP Phone Cleaning
To clean your Cisco Unified IP Phone, use only a dry soft cloth to gently wipe the phone and the phone screen.
Do not apply liquids or powders directly to the phone. As with all nonweatherproof electronics, liquids and
powders can damage the components and cause failures.
When the phone is in sleep mode, the touchscreen is blank and the Select button is not lit. When the phone
is in this condition, you can clean the screen, as long as you know that the phone will remain asleep until after
you finish cleaning. If the phone is likely to wake up during cleaning, wake it up or wait until it is awake
before following the preceding cleaning instructions.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
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Troubleshooting and Maintenance
Cisco Unified IP Phone Cleaning
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