I have an account with Voiptalk, and I have setup in my FreePBX box, and it gets registered and so on,
The problem is that when I make a call, I dont hear any ringing sound, but in the other side it rings, they can hear me, but I cannot hear them.
This only happens with this account, I have other SIP provider account in the same box, and the calls go out correct.
I have all the firewall ports open.
Anyone know what could be the problem?

thank you