Cisco Unified Ip Phone Cleaning - Cisco 3905 Administration Manual

Troubleshooting and Maintenance
Metric Change
MOS LQK scores decrease
significantly
MOS LQK scores increase
significantly
Voice quality metrics do not account for noise or distortion, only 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. 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.
Condition
Network impairment from packet loss or high jitter levels:
Cross-check the conceal ratio and conceal seconds for evidence of
packet loss and jitter.
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
• Average MOS LQK decreases may indicate widespread and
uniform impairment.
• Individual MOS LQK decreases may indicate bursty impairment.
• 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.
Cisco Unified IP Phone Cleaning
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