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Atlas550 PRI channel order

I have come across a 550 that has a PRI on N1, and a PRI-4 card in S1. The PRI-4 has a PRI going to a phone system (S1-1) and a PRI going to a fax server (S1-2). On the phone system, I'm seeing inbound calls coming in on high channels (descending), and I am looking for a way to reverse that. When I view the status of the interfaces, I can see inbound calls ascending on N1 and descending on S1-1. I looked at dedicated maps and there are no entries, so I assume the 550 is mapping in some default fashion. If it is possible, how do I reverse the channel order mapping from N1 to S1 so that calls are ascending on both?

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