When this type of situation occurs CallManager provides Unity with OriginalCalledParty and lastRedirectingParty data. The TSP was designed to integrate on OriginalCalledParty only, not the lastRedirectingParty.
So if user C calls user B who forwards to user A who forwards to Unity, user B is going to be the OriginalCalledParty and the call is not going to get integrated.
This functionality is hard coded in Unity. It would be possible to change this. If you require it you should have your account team open up a feature request.
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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 ...