Cisco Unified IP Phone 8941 Administration Manual page 9

Contents
Cisco Unified Communications Manager and TFTP Services Are Not Running
Configuration File Corruption
Cisco Unified Communications Manager Phone Registration
Cisco IP Phone Cannot Obtain IP Address
Phone Reset Problems
171
Phone Cannot Connect to LAN
Phone Resets Due to Intermittent Network Outages
Phone Resets Due to DHCP Setting Errors
Phone Resets Due to Incorrect Static IP Address
Phone Resets During Heavy Network Usage
Phone Resets Due to Intentional Reset
Phone Resets Due to DNS or Other Connectivity Issues
Phone Does Not Power Up
Cisco IP Phone Security Problems
CTL File Problems
173
Authentication Error, Phone Cannot Authenticate CTL File
Phone Cannot Authenticate CTL File
CTL File Authenticates but Other Configuration Files Do Not Authenticate
Phone Does Not Register
Signed Configuration Files Are Not Requested
802.1X Authentication Problems
802.1X Enabled on Phone but Phone Does Not Authenticate
802.1X Not Enabled
Factory Reset of Phone Has Deleted 802.1X Shared Secret
Audio and Video Problems
Phone Display Is Wavy
No Speech Path
177
Choppy Speech
177
Poor Audio Quality with Calls that Route Outside Cisco Unified Communications
Manager 178
Insufficient Bandwidth for Video Calls
Video Changes Resolution
General Telephone Call Problems
VPN-Connected Phone Does Not Log Calls
Phone Call Cannot Be Established
Cisco Unified IP Phone 8941 and 8945 Administration Guide for Cisco Unified Communications Manager 10.0 (SCCP
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and SIP)
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