Hi again, thanks for all the help!

Still not working, but getting there.

This router is connected to another router (netgear FVS318) and this
sems to be the problem, because when I connect the WRP200 direclty to
the internet (via PPOE and a modem in bridge mode) it worked!

I have open ports 3830, 5600 (seems to be the one used by voipbuster)
and 3478 (stun server) I have also redirected to the WRP200.

Another issue is that (God knows why) my netgear does not pick DNS
servers and I have to introduce it manually, I tried in the wrp200 to
do both ways (automatic and manual) and none worked.

Thanks again

PA