My understanding is this:
Upgrades to a new "train" of code requires a new Software Feature License. So for example;
CUCM 6.0(x) to 6.1(x) = No
CUCM 6.(x) to 7.0(x) = Yes
In these cases, if you are current on UCCS then you can order the appropriate upgrade via the Product Upgrade Tool (PUT).
Hailey
Pls rate helpful posts!