1.) If upgrading from 12.0, do I have to go to 14 first, or do I have to upgrade to 12.5, then 14, then 15 2.) I have 4 3cx servers all interconnected. If all of them are on 12.0, do I have to upgrade each one incrementally (12.0 to 12.5 to 14 to 15) or can I update one server just to 15 before starting another? 3.) I have licenses for 12.0. Does that license carry over to the newer versions of 3cx? Edit: I may have misspoke, I have 12.5 installed on all of the VOIP servers.