I have a question for jason.
Are you sure that is the way the license works? If you upgrade the code itself, u make it available. If you write something which works on top of it, you don’t have to share it.
I know this is a fine line, but I believe it is true.
For example, you write an application to run on it, it is yours to sell, but you dont have to send it to asterisk community. Can you verify.
BTW, I am NOT a developer, just trying to understand the open source license.