Martin, I've already double, tri checked user/pass. I'm sure they are ok. And I'm using just the same ones in my X-PRO to register with no problem at all. (And yes...I unregister/close X-PRO to try to register with VoXaLot).
Now I sent an email to the provider asking them if they block registrations from IPs that are not in Brazil. I don't believe this, but just in case...
Besides user/pass (and I guess blocked IPs) is there other causes for the "Auth. Sent"?
If you prefer I can PM you my user/pass so you can try yourself.
About the unregister...there's more than 1 month! And nothing...
Thanks for your help, Wilson.