Have you tried using PBXes.com as an intermediate step?
If you register the DID with them you can set up a rule to forward its incoming calls to an extension that you have created. If that extension is mapped to SIP/xxxxxx@us.voxalot.com, incoming calls will be delivered to your ATA.
I use this method for suppliers who cannot (or will not) forward to Voxalot.
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