Condition
Metric Change
Network impairment from packet loss or high jitter levels:
•
Average MOS LQK decreases may indicate widespread and
uniform impairment.
•
Individual MOS LQK decreases may indicate bursty impairment.
Cross-check the conceal ratio and conceal seconds for evidence of
packet loss and jitter.
MOS LQK scores decrease
significantly
•
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.
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.
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
95
Troubleshooting and Maintenance
Cisco Unified IP Phone Cleaning