Like mentioned by comments here, the behavior is as expected by specs, the
proxy has to resolve the R-URI address for forwarding. The ACK following 200ok
is independent of INVITE transaction (can have also different path than the
INVITE, a matter of Record-Route headers).
Use other variants if you want to keep the ip/port of the callee, like a dialog
variable, or htable value based on call id and to-tag, or even use
set_contact_alias()/handle_ruri_alias() for a solution that doesn't require
storage inside kamailio.
I am closing this one, if you want to discuss further about possible solutions,
write to sr-users mailing list.
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