The 3rd post from the top gives more detail on the situation and how this is working/not working. The issue appears to be when these 3 800 #'s try to route to MM after coming in on my LD trunk. The other 800 #'s all route over my local PRI which is where all of my lines are supposed to point. I don't know how these are coming in on the LD trunk and both AT&T, local PRI provider, and Windstream, LD provider, have gone over the routing from their perspective and they say everything is correct. We all know they lie when they need to but at this point I can't prove to either of them that it isn't my equipment. The bad part is that this may have started happening around the time of the SIP change or it may have only started happening after Paetec became Windstream. They assure me that no changes to their network have been made yet but the 1 800 number that is a hot topic for me would have identified this problem almost immediately and they didn't say anything until the end of September. The SIP connection went in at the end of June and I got a report of a problem with one of the other numbers around mid July. The problem with the other 2 numbers is they don't get much use so it is hard to pinpoint when this problem actually began. I have had Tier 3 Avaya business partner engineers looking into this and working with Paetec but after all the testing was done everyone was still confused as to what is causing this problem. I am in the process of moving the hot 800 line back to AT&T to see if that will correct the issue. If it does then I would have to believe that something in Paetec's routing is wrong and that would seem to prove it. Do you agree?