I am planning an upgrade from CUCM 22.214.171.1240-3 to 126.96.36.1990-1, and nowhere is the upgrade path from 6.0 listed in the release notes.
Do I need to upgrade to 6.1.2 first, then move to 6.1.3?
This is most correct my friend :) This upgrade will be a two-step method (6.0 to 6.1(x) first). The upgrade paths are nicely shown in this excellent doc;
Hope this helps!