Phone Cannot Connect to TFTP Server or to Cisco Unified Communications
Manager
81
TFTP Server Settings
81
IP Addressing and Routing
81
Cisco CallManager and TFTP Services Are Not Running
81
Configuration File Corruption
82
Cisco Unified Communications Manager Phone Registration
82
Cisco Unified IP Phone Cannot Obtain IP Address
82
Cisco Unified IP Phone Resets Unexpectedly
83
Physical Connection Problems
83
Intermittent network outages
83
DHCP Settings Errors
83
Static IP Address Settings Errors
84
Voice VLAN Setup Errors
84
Phones Have Not Been Intentionally Reset
84
DNS or Other Connectivity Errors
84
Power Connection Problems
85
Audio Problems
85
No Speech Path
85
Choppy Speech
85
Poor Audio Quality with Calls That Route Outside Cisco Unified Communications
Manager
86
General Telephone Call Problems
86
Phone Call Cannot Be Established
86
Phone Does Not Recognize DTMF Digits or Digits Are Delayed
86
Troubleshooting Procedures
87
TFTP Settings
87
DHCP Setting Verification
87
Start Service
87
Create New Configuration File
88
Determine DNS or Connectivity Issues
89
General Troubleshooting Information
89
Additional Troubleshooting Information
91
Maintenance
91
Cisco Unified IP Phone Reset or Restore
92
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
vii
Contents