I think DND ON is right, here's an easy check: put the DID back into your system (shouldn't make a difference for most calls, since carrier is not sending those calls to you). Point the DID to a specific extension. Call the number, see where it goes. If it goes to the ext you set, you know the call is leaving you but YOUR carrier is still sending the calls to you, not the outside destination. Calls are routed based on a translation table at the carriers and I've often seen it take days for changes to roll out to all carriers. Surprisingly the most problems with this are within a carrier, have seen lots of folks who could call numbers from other carriers fine but couldn't call numbers within the same carrier.