Your problem is that video endpoints don't support Alt-GK. In that environment the endpoint will register with it's primary GK, and in the RCF and GCF it will recieve a list of alternate GKs. If the primary gatekeeper fails to respond the endpoint will then register with the next GK in the list and life is good. Currently Tandberg has some code that supports Alt-GK, but I don't think they have released the code.
The only other option is to use HSRP for redundancy. If you need a paper explaining Alt-GK configuration let me know.
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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 ...