Voice Call

Hello Dear Friends!

I´m using spark in my job and it´s works so fine. Inside the same network I make voice call very well but when i try to make a voice call to another network, like a computer at internet or in another network, it doesn´t work.

My firewall is with port 5222 open and the range 10000 to 20000 open to. I enabled the option media proxy to… but still doesn´t work…

How can I do it? Can server to server connection work in this case? Somebody help me please!!