i read faq and description this software but i have a question. I think that i comprehension this text.
I comprehension that is a server Mumble and this server can handle only 6 users. This 6 users is a per session or at all the server instance ?
Not sure I understand what you mean. Are you sure you didn't read about some specific hosting offer with a 6 slot limit somewhere? What point in our FAQ are you talking about?
A single virtual mumble server can handle hundreds of users (whether you would want to do that is another question ;) ). Just take a look at the public server list. Some servers regularly have 100+ concurrent users on them.