Procotol Application Invalid with SIP image on 7940
All of a sudden a 7940 is getting the message "Protocol Application Invalid" on the LCD. It's impossible to use the keypad, but it is possible to reset the phone to factory defaults by the normal procedure. However that doesn't correct the problem.
I've also tried performing a firmware upgrade. The phone contacts the TFTP server and the file is served. The phone says it's inspecting the load file, then goes back to the "Protocol Application Invalid" message on the LCD.
I found lots of other people having the same problems, without any obvious solutions (as a factory reset doesn't help). Also, I found an article by Cisco regarding the CM software and the dhcp option 150 bug, but this isn't relevant here.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...