Our carrier, icall, had the same problem, so it wasn't just vitality. It got fixed this morning:
2010-05-21 8:32AM EST - XO Communications and Acme Packet, the vendor of the failed equipment, have made repairs and resolved the issue. We do not expect any further issues at this time. A formal RFO will be provided once we have received one.
2010-05-20 9:53PM EST - XO technicans have been unable to remedy the issue in the projected timeline. We are awaiting further updates.
2010-05-20 8:48PM EST - XO technicans are on-site and have provided an estimated resolution time of 30 minutes.
2010-05-20 7:15PM EST - XO Communications, one of our primary inbound DID providers, is currently experiencing a major equipment outage. This outage is affecting many of our US inbound DIDs.
So, no, it doesn't look like an billing dispute imo.
CPC Technologies, LLC.
817-435-0010 x 5040