•
After you attempt these solutions, if the phone screen on the Cisco IP Phone does not display any
characters after at least five minutes, contact a Cisco technical support representative for additional
assistance.
Related Topics
Verify Phone Startup, on page 40
Phone Displays Error Messages
Problem
Status messages display errors during startup.
Solution
While the phone cycles through the startup process, you can access status messages that might provide you
with information about the cause of a problem. See Display Status Messages Window section for instructions
about accessing status messages and for a list of potential errors, their explanations, and their solutions.
Related Topics
Display Status Messages Window , on page 174
Phone Cannot Connect Using DNS
Problem
The DNS settings may be incorrect.
Solution
If you use DNS to access the TFTP server or Cisco Unified Communications Manager, you must ensure that
you specify a DNS server.
Related Topics
Verify DNS Settings, on page 213
Configuration File Corruption
Problem
If you continue to have problems with a particular phone that other suggestions in this chapter do not resolve,
the configuration file may be corrupted.
Solution
Create a new phone configuration file.
Cisco IP Phone 7800 Series Administration Guide for Cisco Unified Communications Manager
208
Startup Problems
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