First, it sounds like what you're looking for is digital networking. If you configure digital networking, you will be able to send messages between Unity servers. For example, create a new message locally and address it to a remote recipient via TUI, or you can also forward messages between subscribers at both locations.
4.0.x will give you the most options for networking your Unity servers, make sure to check the configuration guide for your version to make sure you will not run into any limitations.
To answer your questions more specifically, see below:
Q1) Yes, but you'll either have to buy additional ports for each remote location or split the available ports and create separate clusters in the TSP configuration on the Unity servers. I would recommend TSP 7.0.x, and Unity 3.1.x if you plan to try this.
Q2)NO, if you would like to configure failover, you'll need to have both Unity servers on the same LAN or increase the bandwidth between sites.
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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 ...