Cisco 8800 Series Administration Manual page 13

Contents
Cisco Unified Communications Manager Phone Registration
Cisco IP Phone Cannot Obtain IP Address
Phone Not Registering
Phone Reset Problems
295
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
Phone Cannot Connect to LAN
Cisco IP Phone Security Problems
CTL File Problems
297
Authentication Error, Phone Cannot Authenticate CTL File
Phone Cannot Authenticate CTL File
CTL File Authenticates but Other Configuration Files Do Not Authenticate
ITL File Authenticates but Other Configuration Files Do Not Authenticate
TFTP Authorization Fails
Phone Does Not Register
Signed Configuration Files Are Not Requested
Video Call Problems
299
No Video Between Two Cisco IP Video Phones
Video Stutters or Drops Frames
Cannot Transfer a Video Call
No Video During a Conference call
General Telephone Call Problems
Phone Call Cannot Be Established
Phone Does Not Recognize DTMF Digits or Digits Are Delayed
Troubleshooting Procedures
Check TFTP Settings
301
Determine DNS or Connectivity Issues
Check DHCP Settings
Create New Phone Configuration File
Identify 802.1X Authentication Problems
Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager
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