[SR-Users] Determine correct port in record-route if kamailio is behind NAT

[Michal Popovic]

Hello,

so it looks like kamailio used random port for opening connections to our partners but did not updates record-route port properly. AWS has symmetric NAT and that works fine.

Is there any way how to identify port and rewrite record-route?

Thanks.

Bye,
Michal

> On 7 May 2020, at 17:25, Michal Popovic <michal.popovic at cloudtalk.io> wrote:
> 
> Hello,
> 
> our kamailio used for sip trunk interconnections is behind NAT and our cloud provider opens random outgoing ports for outbound connections.
> Our record-route is set to our external address and port 5060, that is probably incorrect, but we did not had any issues.
> One of our partners suddenly begin sending BYEs to the port advertised in record-route instead of port from where he received call.
> 
> What is a correct approach here if we are not able to determine open port behind NAT?
> 
> Bye,
> Michal
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