Cisco CP-7962G Administration Guide - Page 201

Chapter 9 Troubleshooting and Maintenance Where to Go for More Troubleshooting Information Table 9-5 Changes to Voice Quality Metrics Metric Change Condition 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. Conceal Ratio and Conceal • Network impairment from packet loss or high jitter. Seconds increase significantly Conceal Ratio is near or at zero, • Noise or distortion in the audio channel such as echo or but the voice quality is poor. 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. 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 only a dry soft cloth to gently wipe the phone and the LCD screen. 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. OL-21011-01 Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP and SIP) 9-17