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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