After reading this doc (my first time too) it looks like SRST 2.1 only supports an analog integration with Unity or any other PBX.
A Skinny (SCCP) integration is what I believe your looking for but this isn't it. I have spoke with product marketing about adding this type of support into the Unity TSP (changes need to be made in SRST too) but nothing is planned yet.
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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 ...