Before Upgrade disable the Cisco Extension Mobility service. Navigate to Cisco Unified Serviceability > Tools > Service Activation. Be aware that when you deactivate the Cisco Extension Mobility service, Cisco Extension Mobility users will not be able to log in and log out of phones that support Cisco Extension Mobility.
I performed the upgrade just this Saturday and it seems to have gone just fine.
Here's what we did in a nutshell:
Customer purchased the upgrade licenses (SASU contract) and we used the PUT (Product Upgrade Tool) to register these and obtain the licenses and software for the upgrade.
We registered the PAK codes using the publisher MAC address.
We were sent software for 6.1(3) with the upgrade - this is what Cisco are shipping now, not 6.1(2-x). We thus went straight to this version using the 6.1(3) upgrade disk (CUCM Upgrade 5.x to 6.1(3) media).
We did the publisher first choosing NOT to switch to the upgraded partition.
We then did the primary TFTP server in the cluster and then the subscribers.
Once we had all nodes ready, we switched partitions in the same order as above.
Monitoring was maintained using RTMT (you'll need to download the newer plugin once your 6.1(x) is running). After around 15 minutes after the final node was switched, DB Replication was good throughout the cluster.
Are there any specific things you want to know? I followed the Cisco documentation where possible and all seems to have worked just fine.
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