Create one routing profile called something like "To IPO" with two entries, rank 1 and rank 2. Rank 1 is assigned a URI group matching incoming calls destined for site A. Rank 2 has no URI group assigned and it used as a default catch-all. Any incoming traffic not matching rank 1 will route per rank 2 and flow to site B.
It's important the URI group criteria matches ALL traffic for site A, for example by DID range. I have best luck with URI groups using regular expressions.
Hope this clears things up for you.
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