Thanks again, Ron, for your support.
As you can see in attached files, I have all my Skypho numbers registered on Voxalot and no one on SPA2002. Exact as you suggest me to do, but this way, changing properly dial plans as well, I can't receive calls from other Skypho users yet, neither within my own numbers if I try to call one! I don't know why. Something wrong with Voxalot numbers registering happens with Skypho... But the strangest thing is that those numbers from a Skypho phone don't exist; not aren't reachable...!! Is it me to be not able to manage?!!
Regards.