[cisco-voip] CUCM 6.x MIGRATION to 7.x

[study group]

 We are going to migrate the CUCM from 6.0.1 to 7.1.1. The new CUCM 7.X will
be installed on a new MCS hardware.
The problem is how to migrate the data of the previous CUCM 6.x

I know we have to use DRS to take the backup of the CUCM 6 to do this. But
will the CUCM 7.x will accept the DRS of the CUCM 6.0.1.
Or

We have to upgrade the CUCM 6.0.1 to atleast 6.1.3 then to 7.1.1. Then take
the DRS and push the DRS to the new installed CUCM MCS server.
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