Cisco 8961 - Page 14

Cisco Unified IP Phone Security Problems 273
CTL File Problems 273
Authentication Error, Phone Cannot Authenticate CTL File 273
Phone Cannot Authenticate CTL File 274
CTL File Authenticates but Other Configuration Files Do Not Authenticate 274
ITL File Authenticates but Other Configuration Files Do Not Authenticate 274
TFTP Authorization Fails 274
Phone Does Not Register 275
Signed Configuration Files Are Not Requested 275
802.1X Authentication Problems 275
802.1X Is Enabled on Phone but Phone Does Not Authenticate 276
802.1X Is Not Enabled 277
Factory Reset of Phone Has Deleted 802.1X Shared Secret 277
Camera, audio, and video problems 277
No Video 277
Phone display is wavy 278
Video Freezes 278
Audio/video is not synchronized 279
No audio 279
Video is too dark 279
Poor quality or grainy video 279
Video is blocky or distorted 280
Video is slow moving or jittery 280
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 281
VXC VPN Troubleshooting 282
Phone Does Not Set Up VXC VPN Tunnel 282
Identify VXC VPN Connection Problems 282
General telephone call problems 283
Phone call cannot be established 283
Phone does not recognize DTMF digits or digits are delayed 283
Troubleshooting procedures 284
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
xiv
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