As long as you follow the steps including:
Apply the latest system update.
Run DMM to export the data off the BCM 4.0
Upgrade the hardware.
Apply the latest system update.
Run DMM to import the data into the BCM 450.
I had Avaya change the upgrade guide, as it does not include pre-requisite Service updates that DMM requires. If you just follow the upgrade guide, without meeting the prerequisite system updates, telephony will not import correctly. I don't know if Avaya have released the new upgrade guide publicly yet.
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