Cisco 7800 Series

Possible Explanation and ActionDescriptionMessage
If you are using DHCP, verify that the DHCP
server is pointing to the correct TFTP server.
If you are using static IP addresses, check
configuration of TFTP server.
TFTP server is pointing to a directory
that does not exist.
TFTP Access Error
Contact Cisco TAC.The phone does not recognize an error
code that the TFTP server provided.
TFTP Error
Network is busy: The errors should resolve
themselves when the network load reduces.
No network connectivity between the TFTP server
and the phone: Verify the network connections.
TFTP server is down: Check configuration of
TFTP server.
TFTP server did not respond.TFTP Timeout
Authentication typically times out if 802.1X is
not configured on the switch.
Supplicant attempted 802.1X transaction
but timed out to due the absence of an
authenticator.
Timed Out
Cisco IP Phone 7800 Series Administration Guide for Cisco Unified Communications Manager
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Cisco IP Phone Status