So.. I did read the manual and searched the forums.. didn't find. I opted to use a "3cx.us" cert signed by that Let's Encrypt CA. It expires in 90 days.. so will the system take care of the renewal.. or do I have to babysit something every quarter now? Aside.. for our own system I used our own wildcard certificate.. which is due to expire 10/15/2016. Where and how can I renew/replace the cert? I can get my own PFX again if I renew separately from this system (and likely will.. is a wildcard and affects more than 3CX..). But.. where would I apply something new?