I have two CUCMs - CUCM 7.1.5 and CUCM 8.6.2
Both of them are on hardware platforms.
CUCM 7.1.5 is in a production with bought licences.
CUCM 8.6.2 is only installed without any configuration. But with bought licences already.
So I need to MIGRATE from the 7.1.5 to 8.6.2 without the loss of data.
All I've found is about the UPGRADE from 7.1.5 to 8.6.2
And this is not my case.
I need the MIGRATE
Please show me the right way of the migration, please :)
To upgrade on the same hardware, you do not boot from disk. The simplest way for you to proceed would be to insert the disk when CUCM is running, browse to CUCM OS Administration and navigate to Software Upgrades>Install/Upgrade.
There are several ways of performing the upgrade and recommend you review the below before proceeding.