I might be having the same problem. Since Saturday my provider voip.co.uk is not working. I thought it was to do with me getting my old voip phone out of the cupboard and plugging it in, but that is now back in the cupboard and problem still there.
The provider shows Voxalot as registered normally but inbound calls go to the providers voicemail. That would normally happen if I was in a call or not logged on to Voxalot.
I am also registered with voipdiscount. I use the eu server.
I hope this can be solved asap