Question about Call Forwarding Busy(CFB)

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Use case: A call B(Busy), AS forward the call to C.

By TISPAN standard(current 3GPP 24.404), AS would send INVITE to C. And this INVITE contain A's initial Offer.

But if considering precondition, B would has Offer/Answer with A.
Now, should the INVITE(by AS) contain A's initial Offer or not?  Or is there standard define it?

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