Is there a minimum version that will work with UCM 6.0? Currently running 4.5 with UCM 5.1 and wanting to upgrade that to V6.
I haven't found any declaration stating a version requirement such as 5.X or the new UCCX V6.
You will need to upgrade UCCX to 5.0(1). The 6.0 version of UCCX will support Call Manager 4.3(1).
Here is a PDF for reference (look at page 108 for Call Manager 6.0)
I hope this helps...