[OpenSIPS-Users] media server behind nat

[Stefano Pisani]

Please post a link with your network drawing. Your description is unclear.

Il 05/02/2014 20.19, Tony Ward ha scritto:
>
> Hello,
>
> I currently have a media server behind a nat firewall with calls 
> delivered via a PSTN Trunk.  I want to add a 2nd media server and 
> route calls to either depending upon the dialed number.  I've been 
>  trying to do this using drouting in opensips 1.10.0, but cannot get a 
> configuration that works.
>
> I started by generating the 'trunking script' using make menuconfig, 
> and populated mysql to accept my PSTN trunk and route to my media 
> server.   When an incoming call arrives, it is directed to opensips, 
> and forwarded to media server with a record-route header containing my 
> private ip.  This confuses my PSTN partner and we are unable to 
> establish the rtp stream.
>
> After reviewing the mailing lists I tried setting alias and 
> advertised_address=my public ip.  Now when an incoming call arrives it 
> is directed to opensips and forwarded to the media server with a 
> record-route header containing my public ip.  Call setup completes 
> successfully. Call teardown initiated from PSTN trunk completes 
> successfully.  Call teardown initiated from media server fails because 
> the media servers sends BYE  to the public IP, and the NAT router does 
> not know what to do with it (destination unreachable).
>
> It seems as though the invite to my media server needs to have a 
> record-route header with my private ip, while the ok response back to 
> my PSTN provider needs to have a record-route header with my public 
> ip.  Is this the right approach?  I've briefly toyed with rtpproxy and 
> also b2bua without much luck, and was hoping this simpler solution 
> could be made to work.
>
> Thanks,
>
> Tony
>
>
>
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