[OpenSER-Users] STUN working!!

[Dan-Cristian Bogos]

Hi Iñaki,

in the case of STUN  the connection information is already written
with public ip,  and could be that it is wrong detected (when it comes
to port). Therefore u need a way to rewrite this info with the right
IP as far as I understood (internal in this case, so the people behind
the same NAT should send media directly to internal ip) . Maybe I am
mistaken.

DanB

On 8/3/07, Iñaki Baz Castillo <ibc at in.ilimit.es> wrote:
> El Friday 03 August 2007 11:15:57 Marc LEURENT escribió:
> > Hello everybody,
> >
> > To remind you, I'm trying to set a SIP architecture for NATTED SIP users
> > without using any rtp proxy (because of lack of ressource).
> > STUN is working very well between 2 users in 2 differents NATs.
> > But when they are behing the same NAT, they cannot reach the other.. In
> > the INVITE and 200Ok SDP fields, they have put their public address with
> > a port reserved with STUN: it's not working!
> > I think that it is because it's difficult for them to reach the public
> > IPaddress/port where they should send the RTP stream from inside the NAT.
> >
> > So my idea was: Why not rewriting SDP fields to put their private
> > address when they are behind the same NAT
> > But I don't know how to rewrite the SDP fields for both users. (I have
> > the private address of both users in the location database)
>
> In NAT cases I compare the source IP of the caller with the IP where the
> called is:
>
>
> NOTE:
> modparam("usrloc", "nat_bflag", 6)
>
> if (nat_uac_test("19")) {
>   ...
>    setbflag(6);  # NAT flag general
>    if (method!="REGISTER") {
>                 fix_nated_contact();
>                 setbflag(5);  # NAT flag just for the caller
>
>
> ...
>
> if (isbflagset(5)) { # Caller is behind NAT
>         if ( $dd == $si ) {
>         xlog("L_INFO", "Both users behind same NAT, so we dont use RtpProxy\n");
>                         resetbflag(6);  # Unset NAT flag general.
>                 }
>         }
>
>
> I think this is better choice than using RtpProxy and setting private IP's in
> SDP and Contact header.
>
>
> --
> Iñaki Baz Castillo
> ibc at in.ilimit.es
>
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