Cisco 7940/7960 Protocol Application Invalid

The easiest way to fix this is to setup Windows DHCP or Linux DHCP and pass TFTP IP address from your DHCP Server.

I fixed my issue by setting up DHCP in Windows 2003, then as per Cisco recommendation, I added the option 150 to the DHCP, check this link:

There is another step, in Windows 2003, after you add the Predefined option, you need to go “Scope Option” and enable “150 TFTP Server IP…”

Reboot the phone, the phone should now connect to your TFTP server and download the recent firmware…


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