An SBC terminates SIP and RTP sessions and behave as "man-in-the-middle" for both. I'm not sure you want to do that...  You probably only want to make sure that the GW's SIP messages have the correct public IP addresses.  You could use SER in front of the GW to do that, or maybe your GW can set the public IP (like ser's advertised_address)

g-)

---- Original Message ----
From: Ray Janoka
To: serusers@lists.iptel.org
Sent: Thursday, September 08, 2005 12:47 AM
Subject: [Serusers] FW: PSTN Gateway on Private IP

> Hi all,
>
>    I am going to need to put my pstn gateway on internal addressing
> in the near future. I was wondering what solutions are out there for
> translating the traffic from public to private? A simple static nat
> using iptables? will that work? Whats out there in the open source
> world that can function like these 'session border controllers'? My
> SER box will still exist on the public internet, but for gatway calls
> I need a way to get my offnet users to this internal ip without
> creating any port conflicts.      
>
> Thanks in advance,
>
> Ray
>
>
>
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