Hi,
You should check SDP in SIP Invites to see where it sends audio. Maybe it points to a wrong IP/port
It's easy to do with sngrep / asterisk pjsip history

Hope it helps

-----Mensaje original-----
De: fernandolopes20003--- via sr-users <sr-users@lists.kamailio.org>
Enviado el: lunes, 7 de abril de 2025 16:48
Para: sr-users@lists.kamailio.org
CC: fernandolopes20003@gmail.com
Asunto: [SR-Users] Kamailio + RTP Engine question

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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