Kamailio behind NAT

Hello,

I am not successful in my attempts to configure my Kamailio to work behind NAT.

The flow of an incoming call is Provider (Internet) -> AWS LoadBalancer -> Kamailio -> Asterisk

Both the Kamailio and Asterisk is on the internal network. The issue I am having is that I need to add Record-Route to the traffic sent back towards the provider, but not to the Asterisk. Currently when I add the record_route() the header is sent to Asterisk which makes it reply to the Kamailio advertised external address for ACKs, BYEs etc.

I have dumbed down my Kamailio config as much as possible for this, to show what I am currently doing.


debug=2
log_stderror=yes
fork=yes
tcp_accept_no_cl=yes
onsend_route_reply=yes
pv_buffer_size=2048
enable_tls=1

listen=udp:<LOCAL_IP>:5060 advertise <EXTERNAL_DOMAIN>:5060
listen=tcp:<LOCAL_IP>:5060 advertise <EXTERNAL_DOMAIN>:5060
listen=tls:<LOCAL_IP>:5061 advertise <EXTERNAL_DOMAIN>:5061

local_rport=on

mpath="/usr/local/lib/kamailio/modules_k/:/usr/lib/x86_64-linux-gnu/kamailio/modules/"

# MODULES
loadmodule "..."

route {

                route(FROM_PROVIDER);

}


route[RELAY] {

                if(!t_relay()) {

                                sl_reply_error();

                }

                exit;

}

route[FROM_PROVIDER] {

               # The Asterisk that should not receive the external dns in the record route header
                ds_select_dst(100, 4);

                # INFO: This adds the Record-Route in all directions
                if(!has_totag()) {
                                record_route();
                }

                route(RELAY);
                exit;

}





/M

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