The major requirement for CPND to pass is that both sides of the trunk 'understand' the IEs that are being delivered. What's the destination that you're sending to? Another M1 or DMS?
Name display over the PSTN is a very tricky proposition indeed. If you deliver the Name to the 5ESS, then the 5E has to 'agree' with whatever switches are down-stream in the call path. This 'agreement' is not very likely for the full path of the end-to-end call. Tie lines are a different story, however.
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