Sorry but

Thanks for the explication but my english is so weak then when i tried to read the book i didn’t understood anythings
and i think to ask my question directly is thebest way
if some one can answer me this will be helpful for me
what i need to make 3 computers (1 server with asterisk and 2 clients with x-lite) make phone calls trought a local area network
thank you for your conprehension and help

What language do you speak ? There are some docs in other languages.