[OpenSIPS-Users] ACK looping behind NAT

[Sreeram Narayanan]

Hi,
Thanks for your response.

I've added the network trace here <https://pastebin.com/raw/Lxi0SRZ4>. I've
masked some of the IPs for security.
This <https://pastebin.com/raw/rCLdemG4> is what the ACK looks like from
the OpenSIPs server. Please let me know if I need to share more information.

On Wed, Nov 15, 2023 at 5:05 PM Bogdan-Andrei Iancu <bogdan at opensips.org>
wrote:

> Hi,
>
> Ideally you should provide a network capture (pcap) from the OpenSIPS
> server, covering both incoming and outgoing traffic - this is the only way
> to understand what is wrong with the call.
>
> As attachments are limited to 40K here, consider using some pastebin or
> other file sharing service.
>
> Regards,
>
> Bogdan-Andrei Iancu
>
> OpenSIPS Founder and Developer
>   https://www.opensips-solutions.com
>   https://www.siphub.com
>
> On 11/13/23 1:26 PM, Sreeram Narayanan via Users wrote:
>
> Hello,
>
> I am trying to use OpenSIPs with the load_balancer module to balance
> inbound calls between 2 Asterisk servers. The setup sits behind a NAT. The
> OpenSIPs server has a public IP and a private IP. When an INVITE arrives,
> it can forward it to one of the Asterisk servers and Asterisk responds with
> a 200 OK. The problem starts when I receive the ACK (from Twilio). The ACK
> starts bouncing between the public IP and Private IP of the OpenSIPs
> server. It doesn't reach the Asterisk server and eventually times out. I
> hope someone can help me with this. Thanks in advance.
>
> Here is my configuration:
>
> ####### Routing Logic ########
>> route {
>>
>>     if (is_method("INVITE")) {
>>         rtpproxy_engage();
>>     }
>>
>>     if ($rm=="INVITE") {
>>
>>         lb_start_or_next(1,"pstn");
>>     }
>>
>>     t_check_trans();
>>     record_route();
>>
>>     t_on_failure("GW_FAILOVER");
>>
>>     # route the request
>>     if (!t_relay()) {
>>         sl_reply_error();
>>     }
>>
>>     exit;
>> }
>>
>> route[RELAY] {
>>     if (!t_relay()) {
>>         sl_reply_error();
>>     }
>>     exit;
>> }
>>
>> failure_route[GW_FAILOVER] {
>>     if (t_was_cancelled()) {
>>         exit;
>>     }
>>     # failure detection with redirect to next available trunk
>>     if (t_check_status("(408)|([56][0-9][0-9])")) {
>>         xlog("Failed trunk $rd/$du detected \n");
>>     }
>> }
>>
>
> --
> - Sreeram
>
> _______________________________________________
> Users mailing listUsers at lists.opensips.orghttp://lists.opensips.org/cgi-bin/mailman/listinfo/users
>
>
>

-- 
- Sreeram
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