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cucmbe 6.x to 7.1.5(SU4) upgrade

Hello -

We are looking to upgrade our CUCMBE CM and Unity System to 7.1.5(SU4) and eventually 8.5. Our current versions are as follows -

Cisco Unity Connection Administration

Version 2.1.4ES5.1000-5

Cisco Unified CM Administration

System version:

I've downloaded the upgrade iso from Cisco's website and acquired proper PAK keys. However; I've found very little information on the upgrade process itself. Will the upgrade media update CM and Unity at the same time or does this require one and then the other? Is there much to the upgrade besides basic information such as IP, NTP, Publisher information, DNS, exc...? Also, are there any items that are known to require reconfiguration after the upgrade (Unity or CM side)?

Thanks in advance!

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