[OpenSIPS-Users] Trouble with nat handling.

[Bogdan-Andrei Iancu]

Hello,

Not clear from the diagram, but the UAC2 is behind the NAT, not OpenSIPS 
and UAC1, right ?

As Laszlo suggested, you need a force_rport(), but not only for INVITE, 
but for all requests coming from behind the NAT - like the BYE, in your 
case.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com


On 04/04/2013 05:29 PM, Гогичашвили Андрей wrote:
>
> Hello! I have some trouble with nat handling.
>
> I have such scheme:
>
> uac1---opensips---(NAT)---uac2
>
> I call to UAC2 and signaling establishment is ok. When  UAC2 sends 
> BYE  opensips translates 200OK (received from UAC1) to the wrong port.
>
> BYE generated by UAC2 has such via header:
>
> "Via: SIP/2.0/UDP 192.168.18.137:5060;branch=z9hG4bK8b517b11a415"
>
> and the BYE comes from U 2013/04/04 17:21:50.287792 1.1.1.1:59292 -> 
> 2.2.2.2:5068
>
> Where 1.1.1.1 -- nat, 2.2.2.2 - opensips
>
> Opensips adds one more via header to the BYE:
>
> Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bK7f45.debc1592.0.
>
> and changes first via header by adding received field:
>
> Via: SIP/2.0/UDP 
> 192.168.18.137:5060;received=1.1.1.1;branch=z9hG4bK8b517b11a415
>
> 200 OK got from UAC1 opensips tries to send not to 1.1.1.1:59292 but 
> to 1.1.1.1:5060
>
> The question is how can we make opensips to send 200 OK to 59292 port?
>
> Thank you for any help.
>
>
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