Our local partner has resolved the issue and all DIDs from the United States (in the areas of Bloomington, IN; Columbus, IN and Vincennes, IN) are now operational again.
The problem started at 2018-12-11, 05:19 GMT. At 2018-12-11, 09:13 GMT the problem was resolved.
We apologize for any inconvenience this has caused. If you need more information on this particular issue, please open a ticket and refer to superticket #183087.
The Voxbone Team