[Users] transparent SIP proxy behind NAT

[Daniel-Constantin Mierla]

Hello,

On 04/18/07 19:51, Jerome Drouet wrote:
> Hello,
>
> here is my network architecture :
>
> user  (private IP )    -------   NAT(user)  -------        
> (INTERNET)     -------    SIPserver
>                                                                         
>            |
>                                                                         
>            |
>             
>                                                              NAT(OpenSER)
>             
>                                                                        |
>             
>                                                                        |
>                                                              OpenSER 
> transparent proxy
>
> or in a few words :
> - user is behind a NAT
> - OpenSER proxy is behind another NAT (public IP of the NAT : 82.x.x.x 
> , private IP of the OpenSER proxy : 192.168.y.y)
> - the SIP server has a public IP address (51.z.z.z)
>
> The user NAT redirects traffic destinated to SIPserver (protocol UDP, 
> port 5060) to the public IP of the OpenSER NAT, which of course 
> redirects it to the private OpenSER proxy address
>
> I'd like to configure OpenSER as a transparent proxy server, just 
> adding a field in the header of register messages during the forward 
> to the SIPserver :
>
> so here are the important parts of the openser.cfg :
>
> ****************************************
>
> listen=192.168.y.y:5060
>
> route {
> ...
>    if (method=="REGISTER") {
>                append_hf("Field : value");
>                route(2)
>                return;
>    }
> ...
> }
>
> route[2] {
> # -----------------------------------------------------------------
> # REGISTER Message Handler
>
>                if(!t_relay("udp:51.z.z.z:5060")) {
>                        sl_reply_error();
>                };
>                exit;
> }
>
> ***************************************
>
> unfortunatly, the "Via" field added by OpenSER contains its private 
> address : i'd like OpenSER to use the IP address of its NAT instead :
>
>        Via: SIP/2.0/UDP 192.168.y.y;.... --->   Via: SIP/2.0/UDP 
> 82.x.x.x:5060;.....
>
> so that the SIPserver will respond through my OpenSER proxy to the user
>
>
> is there any way to do this ?
Look at:
http://openser.org/dokuwiki/doku.php/core-cookbook:1.2.x#advertised_address

Cheers,
Daniel

> it that can help, i'm running openser 1.2.0 from debian packages 
> available from openser.org
>
> in the case openSER cannot do this, do you know any other software i 
> don't know which could do the same things ?
>
> Regards,
>
> Jérôme
>
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