I am getting this on some IP Phones after we just upgraded to 3.3.3sr4a from 3.1.5. The phone reads the following: 'Protocal Application Invalid" then resets and continues to loop with this. Moreso, this happened after we upgraded the phone code to the latest rev.
Had the same issues on the last two installs that I have done. I ended up doing two things that seam to correct the issue. I set the test port on a switch to NOT trunk while forcing the port into the "Voice" vlan. I also used an external power brick. I have not had time to test which one thing is the answer or if a combination of two correc the issue. Once I had got the phone to register a new firm ware was downloaded that I looks to have not been able to download in the past. Keep in mind that this was only need to get past the problem one time. After that it works just fine every where.
I have to think it as something to do with a plain old 7960. None of my 7960G's have had with issue. Something to do with the firmware being signed?
I am getting the same thing. I have a TAC case open, should have a fix today. With my IP phones at the central site they are upgrading fine but the phones at remote offices are failing with the same error. I have tried adding option 150 on the native vlan DHCP server but this has not resolved the issue. It seems that once the phone has uploaded the application loader it is then picking up an IP address on the wrong subnet or not getting one at all and can't perform the upgrade. I will let you know when I have a fix.
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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 ...