Hi Arthur…..First time here so I guess I should have added a few more details….since I work east to west coast, I was asking this more on a technical level. Believe me I am well armed with high blood pressure pills having to deal w/carriers and the whole 9 yards . This customer is in PA………..all DID’s were ported to another carrier leaving the combo trunks void of “any” DID’s; thus leaving the carrier billing for combo GST TKS with no DID’s, yet charging for the NDT. However……….w/ Verizon continuing to bill the NDT’s associated w/the DID’s, when there was no DID’s on the trunks, I wonder the legitimacy of the billing. I guess my question is more functionality oriented in that if charged for the NDT would they in a technical capacity effectually be billing for services not being provided since no DID service existed on the TKS after the PORT? Hope this is clearer and thanks for the speedy input.