> (1) Route set due to 180: <B2BUA1>, <B2BUA2>
> (2) Route set due to 183: <B2BUA1>
> PRACK should be routed as per (2), which will
> not be possible if route set (1) is used.
> Kindly guide where am I missing.

The B2BUA needs to be smart enough to know to not relay the PRACK even
though the Route might indicate to do so.
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