You don't "cluster" Unity servers per se... we support a "failover configuration" with two boxes. It's a hot failover system and yes, it uses SQL replication between the two servers to keep things up to date. There's also a failover replication service installed that keeps items not in the SQL database (i.e. some registry settings and greeting files on the hard drive etc...) synchronized between the two servers.
Here's the admin guide on failover that may be helpful as well:
To add; Unity doesn't use the publisher / subscriber model like CallManager does. With Unity, both instances of SQL are read / write and the changes are merged. With CallManager, the publisher is read / write and all subscribers are read only. The difference is that most moves, adds and changes can be performed on the failover Unity server when the primary is down. For CallManager, no moves, adds and changes can be performed when the publisher is down.
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 ...
This document describe how DST changes and how time changes are
implemented in DST. Daylight Saving Time (DST) is the practice of
setting the clocks forward 1 hour from standard time during the summer
months, and back again in the fall, in order to make b...