Nortel 2001 Installation And Operation Manual page 415

Connection to the Server
After the Nortel logo appears in the display screen, or upon exiting the
Configuration menu, the phone attempts to contact the TFTP Server to check
for firmware upgrades.
The following scenarios are possible:
• No valid TFTP address is specified: The phone proceeds to connect to the
TPS.
• TFTP Server not accessible, or the required file does not exist on the
server: The phone attempts to connect to the TFTP Server a few times
and then abandons it and connects to the TPS.
• TFTP Server accessible but the binary file specified in the required file
does not exist on the server: The phone attempts unsuccessfully to
retrieve the file, displays a prompt File not accessible,
continues to use the previous version of firmware, and connects to the
TPS.
• The required file specifies the same firmware version as the one currently
on the IP Phone: The IP Phone reads the required file, determines that it
is running the correct version, and proceeds to connect to the TPS.
• The required file specifies a different firmware version (older or newer):
The IP Phone downloads and verifies the binary file, and then reboots.
After the TFTP Server connection phase, if the IP Phone cannot connect to
the S1server, the IP Phone attempts to connect to the S2 server. If both
attempts are unsuccessful, the IP Phone displays the message "Server
unreachable, starting in xx seconds." The user can reboot the IP Phone or
access the Configuration menu.
Figure 82 shows a TFTP Server on a network.
Appendix E: TFTP Server
IP Phones Description, Installation, and Operation
Page 415 of 430