What Application Loads are the 7920's using? Does the phone re-associate if you turn in off and then on again? There was an old issue where this would occur, and turning the phone off and then on again would temporarily resolve the issue. This issue is resolved in the more recent loads.
I've experienced the exact same problem. As soon as the customer told me he was using Vista I suggested trying an early version of Windows. The 7920 is EOL and Vista doesn't play well with legacy hardware/software so I doubt this will ever work :(
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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 ...