Take a look at the following 2 links. Although you could choose to do either task first, I would recommend that you upgrade the existing Unity and then perform the steps to replace the server. This will give you a clean install of 4.2 on the new server as opposed to installing 3.1(6) and then upgrading to 4.2.
Upgrading Cisco Unity 3.x Software to the Shipping Version
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...
If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
No. You will only need the SRST licenses on the primary router. Because this feature...