[Serusers] Multiple UA behind NAT and SIP Proxy Outside LAN

Richard richard at o-matrix.org
Sat Oct 30 02:20:08 CEST 2004


You can check if the src_ip and the r-uri's ip address are the same. Just
make sure this is done after lookup() and before being forwarded. This
method has lots of limitations. Check the archive for more discussions. But
most of time it is sufficient.

> -----Original Message-----
> From: serusers-bounces at iptel.org [mailto:serusers-bounces at lists.iptel.org] On
> Behalf Of Allan
> Sent: Friday, October 29, 2004 2:08 PM
> To: Andris Parra L.; serusers at lists.iptel.org
> Subject: Re: [Serusers] Multiple UA behind NAT and SIP Proxy Outside LAN
> 
> I am also looking for a way to determine if two UAs
> are behind the same NAT.  I have found that if I do
> not force rtp_proxy between two UAs known to be behind
> the same NAT, the call is setup and torn down through
> SER and RTP is sent directly between the two UAs.
> This is how I want to call to operate.  I just can't
> see a way via SER's scripting language to make a
> decision based on the src_ip of the initial request
> and a portion of the URI domain, which in my case is
> the IP address of the NAT.
> 
> Regards,
> Allan
> 
> 
>  --- "Andris Parra L." <apl_1980b at yahoo.com> wrote:
> > I4m wondering if there is a way to comunicate UA
> > agents betwen them that are behind the same nat,
> > they are working perfectly with the outside world
> > (I4m not having problems with Nat traversal), but
> > they try to send the RTP and RTCP data to the
> > aparent public IP that they are registered in the
> > Sip Proxy, and of course, the multimedia data isn4t
> > processed by the router because the destination IP
> > is the one asigned to the WAN interface of it and it
> > sees it in the LAN interface.
> > I4m thinking that maybe the Sip Proxy (ser 0.14)
> > isn4t the problem, maybe the infraestructure is not
> > enough, so, is there anything that you could answer
> > me tha guide me in this scenario?
> >
> > I4ll be grateful for any information you could give
> > me.
> >
> >
> >
> >
> > Andris Parra L.
> > apl_1980b at yahoo.com
> > Ipsofactum LTDA.
> > www.ipsofactum.com
> >
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