[cisco-voip] CUCM6 MCS to 8.6 UCS bridged upgrade Question

[Boon]

Hi,

We are planning to upgrade a customer to CUCM 8.6 on UCS from 6.1(3) on
MCS.

I understand the upgrade process but the customer has thrown us a curve
ball by asking that in order to mitigate downtime on their solution we use
a spare MCS server and rebuild it as a Publisher before upgrading to 6.1(4)
then 8.6 ready for the DRS backup and restore onto UCS.

They have around 50 x license files which have been added incrementally
over the last few years.

My question is whether I'll need to get each license file rehosted to the
spare MCS server's MAC or whether I can simply apply for a rollup license
from TAC when it's eventually restored on the UCS?

Has anybody been through a similar upgrade experience?

Thanks in advance
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