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How the responder know the selectors



I've a question plz.
Now Alice wants to send to Bob a packet (say (tcp 88==>21)). Both support 
and require IPsec.
Alice's IPsec module will prevent the packet transmission and commence  
negotiating IKE with Bob beginning with the SA payload. How does Bob, now, 
know the original packet that was tended to be sent (say (tcp 88==>21)) to 
decide on which SA should he negotiate, given that the security services 
proposed depend on the selectors of the packet.
Thanx


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