[Serusers] Rewriting SDP Infos for NAT Traversal

[Greger V. Teigre]

Anthony,
If the only thing you want to do, is NAT traversal, then that's been done 
before.  Have a look at http://onsip.org/ The Getting Started document and 
config files explains how to do NAT traversal with rtpproxy and mediaproxy.
g-)
----- Original Message ----- 
From: "Anthony Chapellier" <anthony at mbdsys.com>
To: <serusers at lists.iptel.org>
Sent: Wednesday, November 09, 2005 3:38 PM
Subject: [Serusers] Rewriting SDP Infos for NAT Traversal


> Hi,
>
> When an INVITE request is incoming, I need to rewrite VIA Header Field, 
> Contact Header Field, (c=) field in SDP message core and (o=) field in SDP 
> message core too with IP public adress of UAC. Those are needed by my SIP 
> Server before SER Proxy forward the request to him.
>
> I got some success with rewriting Contact Header File by using 
> fix_nated_contact() function and (c=) field with fix_nated_sdp("1") 
> function. But I don't succeed at all in rewriting (o=) field and partially 
> for VIA Header Field.
>
> To do so, I tried to use the following function  :
>
> fix_nated_sdp("8");       No Result :(
> forcerport();                  It seems to add real IP public adress and 
> port in VIA header field but it's                                     not 
> rewriting IP private adress
>
> So, finally is it the good way to do this thing or is there something 
> wrong with my behaviour ?
>
> Thanks,
>
>
>
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