[SR-Users] Kamalio + RTP Engine + SIP Client behind NAT

Nuno Miguel Reis nmreis at student.dei.uc.pt
Tue Jan 21 01:53:43 CET 2020

Hi again Richard et al,

In the meanwhile I've figured out what was causing the issue. The problem
was related to the way I had my iptables rules defined. I had :


and only after that

-A INPUT -p udp -m udp --dport 16384:32768 -j RTPENGINE --id 0
-A INPUT -p udp -m udp --dport 49152:65535 -j RTPENGINE --id 0

I basically changed that to:

-A INPUT -m state --state RELATED,ESTABLISHED -m udp -p udp --dport
16384:32768 -j RTPENGINE --id 0
-A INPUT -m state --state RELATED,ESTABLISHED -m udp -p udp --dport
49152:65535 -j RTPENGINE --id 0
-A INPUT -p udp -m udp --dport 16384:32768 -j ACCEPT
-A INPUT -p udp -m udp --dport 49152:65535 -j ACCEPT

and now everything works as expected.

Thanks for all the support anyway.

Nuno Miguel Reis
Departamento de Engenharia Informática
Faculdade de Ciências e Tecnologia
Universidade de Coimbra

On Thu, Jan 16, 2020 at 10:10 PM Richard Fuchs <rfuchs at sipwise.com> wrote:

> On 16/01/2020 12.29, Nuno Miguel Reis wrote:
> Hi again.
> Thanks for all the help and suggestions. I realized the issue happens if
> using kernel forwarding only. If I change rtpengine to start at userspace
> without the kernel module enabled everything works fine as expected.
> Do you have any hints on why this could be happening with the kernel
> module?
> I'm running rtpengine like this:
> usersapece: $ rtpengine -f -L 7 --interface= --listen-ng=
> --tos=184 --sip-source
> kernel: $ rtpengine -f -L 7 --table=0 --interface=
> --listen-ng= --tos=184 --no-fallback --sip-source
> The kernel module receives its instructions from the userspace daemon, so
> there's no reason there should be a difference. Can you post 1) logs and 2)
> the flags you use for your offers/answers?
> Cheers
> _______________________________________________
> Kamailio (SER) - Users Mailing List
> sr-users at lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
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