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For the application your are describing, the ATLAS is like a switch. It can route the call to only one interface at a time, so it cannot ring devices on more than one interface at the same time. So the ATLAS cannot send the call down both PRIs at the same time. I'm afraid this is not possible in the ATLAS.
Hope this answers your question,
Since there has been no further discussion on this, I will go ahead and mark this discussion as "assumed answered." If you have any additional questions feel free to post them.