And the new rep probably said the change would be transparent to your customer. Difficulties can arise when the new provider is using a soft switch and this may be part of the problem. Because the original PRI works, you can insist that the new provider match its requirements. As a provider, they should have all the competitors specs. That being said, some certified Merlin techs will have better suggestions than this,but I suspect that part of the issue is the provider does not have the National Subscriber Digits set correctly. If you are using Automatic Route Select, what happens if you seize a channel directly and place a call? Do you get any kind of TelCo recording? I assume all other types of dialing were ok.