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

[gwenzit]

i have done most of my upgrades this way and used all licenses on the final version. 


Sent from my Galaxy S®III

-------- Original message --------
From: Boon <ciscovoipuser at gmail.com> 
Date:  
To: cisco-voip at puck.nether.net 
Subject: [cisco-voip] CUCM6 MCS to 8.6 UCS bridged upgrade Question 
 
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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