I have no experience with these devices.
Perhaps the first thing to try is to DMZ the IP address of the ATA. This should eliminate any NAT issues with the Sipura 1001.
Another possible avenue is to try to get the account working with an Xten softphone, which is fairly easy to set up, and well documented in the Tutorial section.
This would allow you to isolate the problem as to whether it is in the account set-up, dial-plan, etc, or whether it is device related or ISP related.
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