Cisco 9971 - Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager

Possible explanation and actionDescriptionMessage
Contact Cisco TAC.The phone does not recognize an
error code that the TFTP server
provided.
TFTP error
Network is bus: 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 Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0
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Cisco Unified IP Phone Status