[Serusers] SER with 2 ethernet + PSTN gateway: RTPPROXY bridge mode conf

[Greger V. Teigre]

That's a tricky one :-) A few comments:
- I believe bridge mode is necessary and thus rtpproxy is what you need 
(mediaproxy does not have this capability AFAIK)
- rtpproxy just waits for the peers to connect, it does not connect rtp 
to anything, so if you see traffic from the wrong pstn interface, I 
would look at GW
- Just inspect your INVITE and OK SDP to get the options straight: The 
one going to your 10. network should have the 10.address in SDP, the one 
to your GW, should have your .246 address
- Please note that 0.9.x has a bug (fixed in cvs head). The problem is 
related to signalling on different listen ports/interfaces: If SER is 
configured to listen to more than one port, the signalling may not 
return with the correct src_ip/port (UDP packet, not SIP message). I'm 
not sure if this holds for listening on different interfaces as well, 
but I would think so

g-)

Fabio Macchi wrote:
>
> Hi,
>
>  
>
> I'm using SER with nathelper and rtpproxy as a proxy to guard a PSTN 
> gateway ( calls can only be generated by SIP client and terminated to 
> PSTN, no SIP to SIP or PSTN to SIP calls allowed, REGISTER is not 
> needed ).
>
>  
>
> PSTN gateway and SER eth0 have pubblic internet IP address ( SER eth0 
> x.x.x.246,  PSTN gateway with two interfaces, x.x.x.243 for SIP and 
> x.x.x.244 for RTP ), SER is setted to force rtpproxy for every call 
> and rtpproxy is started in standard mode: this is running fine, every 
> client from internet ( behind a NAT box or not ) is able to place calls.
>
>  
>
> Now the problem is that I need to collect SIP traffic from another non 
> routable network to the PSTN gateway ( es. 10.0.0.0 )  
>
>  
>
> I have connected SER interface eth1 to this network ( ip 10.0.0.1 ) 
> and I am trying to connect to the PSTN from a client in the network 
> 10.0.0.0: SIP signaling seems to be ok, but I'm unable to setup RTP 
> stream.
>
> With this configuration it appears that RTPproxy try to connect to 
> PSTN gateway on x.x.x.243 and not x.x.x.244.
>
>  
>
> I have tryied to set RTP proxy in bridge mode ( rtpproxy -l 
> x.x.x.246/10.0.0.1 ) without succes, but documentation is not very 
> clear about this case (I think it has been designed for client to 
> client, not client to PSTNgateway ).
>
>  
>
>  
>
> .....
>
> if (dst_ip == x.x.x.246) {         #!! Internet IP address
>
>                              force_rtp_proxy("FI");
>
>                              t_on_reply("1");
>
>  
>
>           } else if (dst_ip == 10.0.0.1) {  #!! Private IP address
>
>                              force_rtp_proxy("FE");
>
>                              t_on_reply("1");
>
>           };
>
> .....
>
>  
>
>  
>
>  
>
> Now the question is: what is the correct design to implement this ?
>
>  
>
> RTPproxy in standard mode ?
>
> RTPproxy in bridge mode ? ( how ??? )
>
> Mediaproxy ?
>
>  
>
>  
>
> Any help would be appreciated, many thanks in advance.
>
>  
>
>  
>
> Fabio
>
> ------------------------------------------------------------------------
>
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>   
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