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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