[SR-Users] How to forward sip message "statefully" so that the dialogue is preserved

[aft]

We want to implement the following topology :

INVITE--->kamailio1-----forward--->kamailio2--->route[NATMANAGE]--->Next
Sip endpoint

Client <----
route[NATMANAGE]<--------kamailio1<------forward-----kamailio2<---- reply
with SDP


So the caller to callee will be processed by one kamailio and callee to
caller will be processed by another kamailio. Both kamailio will be up with
a public IP. How this can be achieved?
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