Re: [Linphone-developers] STUN support in linphone 3.0.0

[Aymeric Moizard]

On Thu, 2 Jul 2009, Simon Morlat wrote:

> Hi,
>
> Stun is used to guess external routable address for RTP streams only.
> STUN is useless for SIP, since proxy replies have the 'rport' and 'received'
> parameters in their via field. SIP proxies should stay in the loop of calls
> using record routes and fix contact addresses.
> Furthermore, linphone does double-registration, so that the second register
> fixes the registered contact using the rport/received parameters.
> Objectively there is no more good reasons to have stun for SIP.

I know one!
The "outbound" specification (which is coming to an rfc soon?) use
stun keep alive with a stun server on the same socket used by the
SIP server. Thus, the information provided by this stun server is
correct and match the "received" and "rport".

The really interesting feature is that you can send each 20 seconds
a STUN request to your SIP server so that you are aware if you loosed
your binding or don't have access to your server.

This helped much to realize very soon that your nat has rebooted for
example or that you lost connectivity and have to register again.

That's needed for high availability of SIP phone ;)
-the other way: sending REGISTER/OPTIONS each 20 seconds is too much
overload for the SIP server and is not a good solution for high 
availability and scalability-

Tks!
Aymeric


Aymeric MOIZARD / ANTISIP
amsip - http://www.antisip.com
osip2 - http://www.osip.org
eXosip2 - http://savannah.nongnu.org/projects/exosip/


> Simon
>
> Le mercredi 1 juillet 2009 14:16:50, address@hidden a écrit :
> > Hello,
> >
> >
> > I have a problem with the configuration of the STUN server in linphone
> > 3.0.0. I use the linux command line interface. If I configure the
> > following in .linphonerc:
> >
> > firewall_policy=2
> > stun_server=stun.sipgate.de:10000
> >
> > then I see that STUN is not used during the registration.
> >
> > So I decided to analyze the source code I found out the following
> > fragment in "linphonecore":
> >
> >                         /* we no more use stun for sip socket*/
> > #if 0
> >                         int mport=0;
> >                         ms_message("doing stun lookup for local
> > address..."); if
> > (stun_get_localip(lc,sock,linphone_core_get_sip_port(lc),result,&mport)){
> >                                 if (!lc->net_conf.nat_sdp_only)
> >
> > eXosip_masquerade_contact(result,mport);
> >                                 return;
> >                         }
> >                         ms_warning("stun lookup failed, falling back
> > to a local interface...");
> > #endif
> >
> >
> > So this clearly explains why STUN is not used during the registration
> > process. I tried to compile linphone with un-commented stun support,
> > but the compilation fails. I also checked the source code of previous
> > versions of linphone (2.1.1) and there (according to the source code)
> > STUN is enabled
> >
> >
> > When I looked further in "eXosip.c" I found out also the following
> > strange thing, which might have a connection with the disabled STUN
> > support
> >
> >
> > if (now - jr->r_last_tr->birth_time > 900)
> >           {
> >             /* automatic refresh */
> >             eXosip_register_send_register (jr->r_id, NULL);
> >        }
> >
> >
> > So my questions are
> >
> >
> > 1. Is it possible to re-activate STUN again?
> > 2. What is the purpose of these hard-coded 900 seconds?
> >
> > Thanks & Best Regards,
> > Vesselin
> >
> >
> > -------------------------------------
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