I'm planning to upgrade CUCM from version 4.2.3 to 6.1.2, on 2 servers (Pub & Sub), I have two questions regarding this upgrade:
I received 2 different PAK with the same Product Number (CM6.1U4-K9-7835) SW Upgrade CM 4.1/4.2 to CM 6.1 - 7835, should I activate both on Cisco Licensing website or I should open a TAC case with Cisco to merge both into one license with 2 nodes as each one has only 1 server node license & I have 2 nodes installed in my system (Publisher & Subscriber.
The sequence of the upgrade still confusing in the document, I should run DMA tools only on publisher server or on both publisher & subscriber, after the Publisher upgrade I should apply the license file or after finishing both (Pub/Sub) upgrade.
Kindly if anyone did this upgrade before share with me the exact steps of upgrading 2 nodes.
I already did one node upgrade in Lab and it success to migrate DLUs only but I couldn't activate any feature license or perform this upgrade on 2 servers.