I have a setup like this:

FS(private)-->(private)Kamailio1(Public)-->Kamailio2(public)-->provider.

I have mhomed=0, enable_double_rr=1, I'm listening on 2 different ports, 1 private, 1 public (with advertise) and on Kamailio1 the DISPATCH ROUTE I force the socket

To the private ip when the destination IP is a private IP.

This all works fine.

But When calling OUT (i.e. public) kamailio adds itself only for the private IP:

So when INFO messages come from the provider to kamailio2, kamailio 2 tries to send the INFO straight to "172.21.25.124".

Should i manually add a record-route when calling OUT with

record_route_advertised_address("1.2.3.4:5090");

Or is there a better way of getting this working?