Well,
Voice did works with a old 3Com router but not with teh Comtrend.
2 days modifyng routers parameters, filters, ports, Nats, router firewall, ..., without any solution., using port configuration i found in google, and finally after a blue screen of windows entering SecondLife viewer, have begin to works again voice....
Murphy Law!
Now waiting to next crash, lol
BEst regards
CFalcon