Cisco Ip Phone Does Not Register With Cisco Unified Communications Manager; Phone Displays Error Messages; Phone Cannot Connect To Tftp Server - Cisco 7821 Administration Manual

Startup Problems
• 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 43

Cisco IP Phone Does Not Register with Cisco Unified Communications Manager

If the phone proceeds past the first stage of the startup process (LED buttons flashing on and off) but continues
to cycle through the messages that displays on the phone screen, the phone is not starting up properly. The
phone cannot successfully start up unless it connects to the Ethernet network and it registers with a Cisco
Unified Communications Manager server.
In addition, problems with security may prevent the phone from starting up properly. See
Procedures, on page 189

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 148
Phone Cannot Connect to TFTP Server or to Cisco Unified Communications Manager
Problem
If the network is down between the phone and either the TFTP server or Cisco Unified Communications
Manager, the phone cannot start up properly.
Solution
Ensure that the network is currently running.

Phone Cannot Connect to TFTP Server

Problem
The TFTP server settings may not be correct.
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0
(SIP)
178
for more information.
Troubleshooting