Hi Martin, I've just tried again.
The first status is "Pending". A few minutes later is "Auth. Sent" (I'm not sure if this is the second, or third,...because I could have missed some fast ones). Now, 30 minutes after re-register it is "Auth. Sent" yet.
Feel free to look my user/password/host in the "Tudo Mais" provider and try it "by hand" in your softphone/ATA. Or if you want I can PM you them.
PS: it is not a problem at all for me, but there's another weird registering status in my account with another provider: blaterisk. Once I've asked to register to it and it was fine. Then I've asked to NOT register but it can not! It can not unregister.
Thanks again,
Wilson