So , having completed the upgrade last weekend thought i would shrae my experience given the lack of info that seems to be associated with these upgrades.
I completed a "direct upgrade" which is just upgrading the existing server. The documentation only talks about migrating to new servers but the release notes refer to direct upgrade as supported.
First of all make sure your OS and SQL are supported i was running 10.5.2 which was already running the right versions of SQL and Windows so that made life a little easier.
Then you need to install a Windows patching file , can't remember the KB number but this needs to be done before you attempt the upgrade.You don't need to stop any services either.
Once thats done , you can then run the setup.exe supplied with 12.0.5.10 or whatever version you're using.
The documentation describes whats installed and whats not installed as part of this .exe. The documentation is wrong in regards to this , it will install all the stuff you need prior to the actual upgrade taking place.
Once you've rebooted the actual CUACA upgrade takes place , press next a few times and it will prompt to overwrite the existing database .Say 'NO' this will then upgrade with all existing settings.
It will then ask for the SA and CUCM application accounts , you will need to know the passwords for both of these
press next a few more times and then you can reboot . I am running HA so then after i had done the publisher you then do the subscriber.
After the upgrade the passwords will have all been converted to Uppercase,It's quite clear in the documentation this will happen but i forgot and caused me to panic when i couldn't login.
Once both servers are up and you've logged in , you need to sort out replication , won't go into details as its relatively straight forward
Then finally you will only have a 5 days eval licence, so you'll need to have you lience for the new version ready or at least bought.
Think thats its ... generally quite straight forward ,
