Without an auto-provisioned tftp server address, the phone will only complete half the upgrade and come up with an error message of “protocol application invalid.” This just means that the phone could not complete the second half of the upgrade and needs the tftp ip address to be specified. But what is essential in upgrading these phones is a DHCP server with option 150 enabled – an option to auto-provision the tftp server ip address when the DHCP server hands out the regular ip address to the phone. Once the bootloader is upgraded, all passwords and networking information on the phone will be wiped out. 7940/60 Cisco phones update in two stages. They just need a tftp server to update its firmware and it doesnt even have to be located on the asterisk/phone system itself.
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