What is your largest install and was there anything learned in the process that had you known before would have made it easier? Backstory..... I've setup 3CX for a few friends and family at their smaller businesses usually without drama and all have been happy with it. Most have between 5 and 20 employees. Yesterday I was chatting with a friend who I've helped with on other projects. Somewhere in our chat he started griping about some upcoming renewal and some changes needed to his Mitel system. He has about 350 employees and mentioned something like $90k for license renewals and a few handsets which I though was crazy expensive. I made a comment about 3CX knowing that he would only be in about $15k for a license and server. Then add cost for handsets or use phone app for remote employees. Now he is really interested in more information. He already has dedicated LAN and IP for phone as well as trunk service. I'd have to check to see who the trunk provider is.