Thanks to Tomas Bodzar and Sebastian Reiterbach for the tip. About asterisk and the sugested softphone, I think astersk would be enough, it can be misused as SIP softphone as far as I know, but I never bothered to learn how to use it. Indeed I like very much the simplicity of pjsua.
I tried to use "callcentric.com" with pjsua and ekiga (both in the packages), and I had troubles, I just wanted to prove with softphones that are suported in the webpage of callcentric. By the way, also asterisk is there. I think the problem does not lie in the phone, but in the firewall (callcentric does not use a normal stun server). Rodrigo.
