Hi there,

rtpengine.conf:
interface = 192.168.1.75

Looks like you define a single interface here which works on the local network, but you need to do some NAT if you are going outside of your network using direction flags.

Somethng like this:
interface = private/{{ privateIP }};public/{{ privateIP }}!{{ publicIP }}

Documented here: https://rtpengine.readthedocs.io/en/latest/rtpengine.html#interface-names

As well as your Kamailio understanding internal and external traffic for example. 

A simple way to manage this could be to use a conditional statement for parsing any rfc 1918 addresses from the $si. Or any addresses in a list (permissions module address list) to know if the traffic is going to or coming from the asterisk container. 

Thanks,

John.

On Mon, 7 Apr 2025 at 16:12, fernandolopes20003--- via sr-users <sr-users@lists.kamailio.org> wrote:

Hi everyone,

I'm experiencing some issues with Kamailio and RTP Engine.

Here's the setup:
A user initiates a call, and the traffic goes through a router.
The router forwards the traffic to a machine at 192.168.1.75, which runs Kamailio and RTP Engine.
Kamailio uses a dispatcher to forward calls to 192.168.1.190, a Kubernetes node running an Asterisk container.

The problem:
When I'm inside the network, everything works fine — I can send and receive audio.
But when I'm outside the network, the call connects, but there's no audio in either direction (no send or receive).

Some Configs:
Kamailio.conf:
modparam("rtpengine", "rtpengine_sock", "udp:0.0.0.0:2223")
listen=udp:192.168.1.75:5060
listen=tcp:192.168.1.75:5060
listen=udp:127.0.0.1:5060
# ----- dispatcher params -----
modparam("dispatcher", "list_file", "/etc/kamailio/dispatcher.list")
modparam("dispatcher", "flags", 2)
modparam("dispatcher", "xavp_dst", "_dsdst_")
modparam("dispatcher", "xavp_ctx", "_dsctx_")
modparam("dispatcher", "ds_ping_from", "sip:proxy@kamailio.org")
modparam("dispatcher", "ds_ping_interval", 60)
modparam("dispatcher", "ds_probing_mode", 1)
modparam("dispatcher", "ds_timer_mode", 1)

rtpengine.conf:
interface = 192.168.1.75
listen-udp = 0.0.0.0:2223
port-min = 10000
port-max = 20000

Firewall:
To Action From
-- ------ ----
22 ALLOW Anywhere
12222/udp ALLOW Anywhere
5060/udp ALLOW Anywhere
10000:20000/udp ALLOW Anywhere
22 (v6) ALLOW Anywhere (v6)
12222/udp (v6) ALLOW Anywhere (v6)
5060/udp (v6) ALLOW Anywhere (v6)
10000:20000/udp (v6) ALLOW Anywhere (v6)

Also router has all this ports open

Thank you.
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