On your 81C you need to build a DSC for each extension number on "the box" that you wish to 5 digit dial. These DSC will reference a RLI that points to the tie trunks that connect to the box.
It sounds like a restriction problem. The incoming PRI trunks will have to have an NCOS and TGAR that will allow them to make an outgoing call. I would verify this is the case on the incoming trunk TN.
Check the DSEL setting for the incoming and outgoing routs. If they are different that could cause the error that you are receiving, especially if the incoming rout is 3VCE and the outgoing rout is not.
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