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.
Thank you,
James Lumby
CPC Technologies, LLC.
http://www.cpctechnology.com
817-435-0010 x 5040