Many thanks Klaus,
with "fix_nated_contact", "fix_nated_register" and the "fix_nated_sdp", I have resovled the NAT Traversal.
 
Thanks,
Kevin 
> Date: Mon, 14 Jun 2010 08:31:47 +0200
> From: klaus.mailinglists@pernau.at
> To: kevin.jzh@hotmail.com
> CC: sr-users@lists.sip-router.org
> Subject: Re: [SR-Users] Help need on NAT_Traversal
>
> Everything you want to do is possible with the default configuration.
>
> Just enable all configuration parts with "fix_nated_contact" and
> fix_nated_register".
> This will enable NAT traversal for SIP. Depeing if you want to relay
> media or not just enable/disable the "force_rtpproxy" calls.
>
> regards
>
> klaus
>
> Am 12.06.2010 04:58, schrieb JinKevin:
> > Hi All,
> >
> > I'm building a video conference system with the kamailio and the video
> > AS. The network is as below:
> >
> > UAC(behind NAT) ------ kamailio(public IP) ------ AS (public IP)
> >
> > I have setup the basic kamailio and the SIP signaling can reach the AS
> > and the call can be established. Now the time to setup the NAT traveral
> > since the UACs are behind the NAT.
> >
> > Since it's video scenario, I don't want the kamailio as the RTPproxy so
> > try to use the NAT_Traversal module.
> >
> > From the module doc, NAT_Traversal needs the Dialog module as well.
> > Have no idea on how to load these two modules and the route config
> > required although have readed the module docs. Wondering if someone can
> > help on the config for this scenario?
> >
> > All call with $rU=="0216666" is forwarded to the video AS as the
> > route[CONF].
> >
> > Thanks in advance!
> >
> > Thanks,
> > Kevin
> >
> > Below is the current config of the kamailio server:
> >

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