Are you talking about the 'regular' L3/l4 state table maintained by the firewall? or the Deep packet/Applicaion inspection.
The first one is both ways, meaning any traffic that is allowed to go back is allowed to come back in. Similarly any traffic coming from outside (that is allowed in) will be allowed out (as long as the traffic is part of the same flow).
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...