I have a CS1K, SF rel 4.5 with a PRI on a DS1 circuit. My customer recently discovered that he cannot make calls to the 844 area code and I'm not sure why. As soon as the number is dialed we get a 'fast busy'. The NPA entry for 844 is exactly like all of the other area code entries. D Chan messaging shows the correct number is being presented to the carrier. The telco was out with a t-bird and claims they were able to dial the number successfully from their NIU (I wasn't there to see it). Is there anything else that I should be checking in the CS1K?