I was in TAC at that time and I do not remember TAC supporing the domain controller on either Unity server. At that time the DC/GC had to be offbox as well as the Exchange server. Unless I am remembering UM and VM was supported that way.
I have not seen that before. Normally you can run Unity as DC no matter what. It does put a little more load on the server, but as long as you do not load up 7500 Subscribers AND have it as DC, that would not be recommended because of the load.
If you have that clipping, I would like to see it.
In the past I have always setup (in VMonly) the following setup:
Unity Primary Member server
Unity Secondary (Failover) GC/DC with DNS
Exchange Message server DC with DNS
I looked over the installation guide for 4.x and did not see any mention of not have DC/GC on a Unity box.
In larger setups, I do recommend a 4th AD box just for DC. This will create a backup of your AD domain, users, settings, etc.
If TAC supports your scenario, you should be fine with have like I have.
If it's UM, the Unity servers are member servers typically. I do not dcpromo these servers.
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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 ...