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: http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a008055c1fe.shtml

There is another step, in Windows 2003, . . . → Read More: Cisco 7940/7960 Protocol Application Invalid