Re: [GnomeMeeting-devel-list] SIP, RTP ports and firewall

[Damien Sandras <dsandras seconix com>]

Le mercredi 30 novembre 2005 à 11:14 +0100, Daniel Huhardeaux a écrit :
> Damien Sandras a écrit :
> 
> >Hello,
> >
> >So the problem is fixed. Good news !!
> >
> >PS: the fact that it can't create the sockets is due to the router. No
> >idea why though.
> >  
> >
> I wouldn't share you enthusiasm: 3~4 days ago it was working. Please
> reread previous mails where I said that a minimum of 9 ports have to be
> open to make it work. And now, it's broken again. It's not a question
> of router.
> 

It is a question of router. The STUN code didn't change since several
months, so if it can not create a pair of sockets, then it is because
the router doesn't allow it.

When using STUN for RTP/RTCP, you have to find two open ports on the
router with RTCP port = RTP port + 1, they must be consecutive.

If the range is small, and if your router is busy, it could happen that
it can not open a hole for 2 consecutive ports on it, because those
ports are already used by other applications. In that case, it will
fail.

I hope it makes sense.
-- 
 _      Damien Sandras
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