Cisco 8961 Administration Manual page 14

Contents
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
xiv
REVIEW DRAFT - CISCO CONFIDENTIAL
Cisco Unified IP Phone Security Problems
CTL File Problems
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
802.1X Authentication Problems
802.1X Is Enabled on Phone but Phone Does Not Authenticate
802.1X Is Not Enabled
Factory Reset of Phone Has Deleted 802.1X Shared Secret
Camera, audio, and video problems
No Video
277
Phone display is wavy
Video Freezes
278
Audio/video is not synchronized
No audio
279
Video is too dark
Poor quality or grainy video
Video is blocky or distorted
Video is slow moving or jittery
No speech path
281
Choppy speech
281
Poor Audio Quality with Calls That Route Outside Cisco Unified Communications
Manager 281
Video distorted or pixilated on Cisco Unified IP Phone 9951
VXC VPN Troubleshooting
Phone Does Not Set Up VXC VPN Tunnel
Identify VXC VPN Connection Problems
General telephone call problems
Phone call cannot be established
Phone does not recognize DTMF digits or digits are delayed
Troubleshooting procedures
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