[Devel] [Users] nathelper/rtpproxy when both SIP UA are behind same NAT

[Rafael R. GV]

yes, actually 'nat_flag' parameter its uncommented lines above, as I told in
my last post this configuration works very well, in fact I'am  using it in
a production  sip proxy that serve lots of UA´s like Linksys-PAP, Sipura,
Addpac, X-pro, Snom phones and asterisk, With those UA´s that support STUN
there is no problem because my Stun can find its public ip/port and then
openser will not detect a NATed client and do not enforce
rtpproxy/nathelper, the problem appears only for UA´s behind same nat and
this nat doesn't support hairpinning (send back data in the source direction
to reach the target), so this new solution using avp in combination with
nathelper and STUN will cover a 100% of Nated UA cases and I´d like to
complete and share my configuration that support other useful features the
can be useful for this community, I will appreciate your help in this issue.

thank you
Rafael



On 12/13/05, Norman Brandinger <norm at goes.com> wrote:
>
> Hello Rafael,
>
> I took a very quick look at your conifguration and noticed that you have
> commented out the "nat_flag" line.  This setting is documented here:
> http://www.openser.org/docs/modules/1.1.x/registrar.html#AEN103  I
> believe that you should, at a minimum, uncomment this line.
>
> # modparam("registrar", "nat_flag", 6)
>
> Your configuration looks as though it is based on information from the
> iptel.org site.  I would suggest that you also review the NAT example
> configuration from the onsip.org site.  The onsip.org configurations are
> a little more current.  The nice part of the onsip.org configurations is
> that they are provided with line-by-line explanations.
>
> Regards,
> Norm
>
>
> Rafael R. GV wrote:
>
> > Hi
> > thank you!, now i am using Openser, it was easy to move from ser, just
> > some minor changes like 'break' to 'return' etc, my nathelper
> > implementation is based on a ser example and it works very well, just
> > made some minor changes to set flag 6 and flag 7 to 'Register' and
> > 'Invites' when 'nat_uac_test("19")' in order to try Tavis code
> > snippet, in my tests there is no audio when reset flag 6 and 7 after
> > detected the two clients behind the same NAT and can't hungup or
> > cancel calls properly, please someone see my cfg attached and send
> > some advice, what I am missing?
> >
> > thanks
> > rafael
> >
> >
> >
> > On 12/7/05, *Norman Brandinger* <norm at goes.com <mailto:norm at goes.com>>
> > wrote:
> >
> >     Hi Rafael,
> >
> >     You would use the "example code snippet" when you want to decide
> >     whether
> >     or not to use rtpproxy or mediaproxy based on the fact that both the
> >     caller and the callee are behind the same NAT device.  Please
> >     review the
> >     mailing lists as this topic has been discussed many times.
> >
> >     I added some additional comments in regard to the setting of flags
> >     2 and
> >     3 in the posted example at:
> >     http://openser.org/dokuwiki/doku.php?id=avp_examples
> >
> >     Generally, I have found that if OpenSER fails to start with an error
> >     indicating that the function can't be found, it's time to find the
> >     correct module to add.
> >
> >     In response to your last question "etc." I suggest that you review
> the
> >     three web sites: openser.org <http://openser.org>, iptel.org
> >     <http://iptel.org> and onsip.org <http://onsip.org>.  The last one
> has
> >     some really great material that explains alot.
> >
> >     Regards,
> >     Norm
> >
> >
> >     Rafael R. GV wrote:
> >     > Hi
> >     > I am using nathelper/rtpproxy in ser , please see my ser.cfg
> >     attached
> >     > and tell me where do I have to use this code snippet?  where did
> you
> >     > set flags 2 and 3?, what other modules I need?, etc.
> >     >
> >     > thank you
> >     > Rafael
> >     > Lima-Peru
> >     >
> >
> >
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> >
>
>
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