Thanks for the reply, that's good to know the 8.5 upgrade went ok on the old H3 hardware.  Once I get a DRS export at 8.5, I'll import into new appliance and then go to 8.6 on the 7828-I5.  Good tip on the licenses, I'll try and get them re-homed pri...

It's been over a year since you did this work, but I have exactly the same task ahead, CUCM-BE 6.1.5 on 7828-H3 to 8.6. The latest hardware (7828-I5), does not backwards support below 8.5, so cannot install 6.1.5 on it.I have tried multiple times to ...