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 To :  yate@v...
 From :  Etoile =?iso-8859-15?q?Di=E8se?= <support@e...>
 Subject :  Re: [yate] NAT support for SIP RTP
 Date :  Sat, 19 Aug 2006 09:56:59 +0200
ok, sorry. I did not understand the question yesterday.
My client should send on a regular basis RTP packets on the port it plans to 
use for the next call, isn't it ? I dont think my phone do that. Are there 
any client out there able to do that ? Or would a spoofing of this from 
another computer on the LAN work ?

Le Vendredi 18 Août 2006 19:49, Diana Cionoiu a écrit :
> Hello Etoile,
>
> Does your client open up the hole or not?
>
> Diana Cionoiu
>
> Etoile Dièse wrote:
> >Hello,
> >
> >You gave recently an URL : http://freshmeat.net/articles/view/2079/ that
> >explains how Yate can contact SIP phones inside a NATed network.
> >I use a Linux+iptables router. It does symetric NATing so the port given
> > in SDP header is the same as the port really opened on the public
> > interface of the router :
> >
> >LAN 7080 <------> router 7080 <------> Yate
> >
> >So no problem in this case. I forced the router to be non symetric by
> > forcing a translation of all UDP port between 10000 and 20000 :
> >
> >LAN 7080 <------> router 10001 <-------> Yate
> >
> >But it does not work as you describe in the article. In fact, Yate seems
> > to trust the port given in the SDP header instead of the origin port it
> > detects :
> >
> >LAN 7080 <------> router 10001 --------> Yate
> >                                          7080 <-------
> >
> >and all the RTP packets from Yate to this external 7080 port which is
> > closed are dropped by the firewall. This behavior is not what you
> > describe in the article, why does it happen ?
> >Is there any configuration parameter I missed ?
> >
> >Regards,

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