I have a cluster with three nodes with CUCM 7.0(2) version.
I receive my upgrade SW to upgrade from 7.1.(5), the DVD label is "Cisco Unified Communications Manager 7.1.(5) System Installation DVD (includes CUCM BE and Unity Connection)".
Can i make the upgrade simply by installing from this DVD first on PUB then on SUB without reboot?
Then switch versions?
The HW apliance is MCS7816H3-K9-CMC1.
Yes, you can upgrade from this DVD just as you suggested
Pub (do not switch version when completed)
Subs (do not switch version when completed)
Then Pub - Switch version (wait until completed)
Then Subs - switch version