Re: [GnomeMeeting-list] Re: GnomeMeeting 1.2 and Skype

[Damien Sandras <dsandras seconix com>]

Even if RTP/TCP would be legal, I know no client, no IP Phone supporting
it.

Le lun 11/10/2004 à 17:59, Miguel Rodríguez Pérez a écrit :
> Is there something in the SIP/H323 stabndard that mandate UDP appart
> from being the obvious way to transport RTP? If the standards only
> mandate RTP, and not RTP/UDP, then it should be perfectly "legal" to
> use RTP/SCTP (and maybe fallback to RTP/UDP for compatibility).
> 
> 
> Just 1¢...
> 
> On Mon, 11 Oct 2004 17:36:58 +0200, Kilian Krause <kk verfaction de> wrote:
> > Hi Damien,
> > 
> > > > Anyone knows what's happening on the side of the SIP/H323 standards with
> > > > regards to NAT? Any planned standard enhancements?
> > > >
> > >
> > > The problem is not with SIP or H.323. The problem is with NAT itself.
> > > The day when the Linux Kernel and most hardware routers will natively
> > > support SIP (or H.323), then you will have no problem to go through NAT
> > > with software like GnomeMeeting.
> > 
> > the whole issue would ameliorate if UDP was replaced by SCTP in H323 and
> > SIP. Then routers could use regular connection tracking like with TCP
> > and you still got the speed and "reliability" of UDP. That way most
> > probably the IETF will "fix" SIP over NAT as a general resolution.
> > 
> > > Perhaps it is too late for H.323, but most hardware routers start
> > > supporting SIP natively, which means that you can be behind that router,
> > > and call anybody without any problem. Of course, at least one port
> > > forward is still required if you want to be able to receive incoming
> > > calls.
> > 
> > unless you have UPnP on the router and your workstation does advertise
> > the port for you. Then the router might magically "know" where you are
> > without having you to specify it manually.
> > 
> > --
> > Best regards,
> >  Kilian
> > 
> > 
> > _______________________________________________
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> > http://mail.gnome.org/mailman/listinfo/gnomemeeting-list
> > 
> > 
> > 
> >
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-- 
 _      Damien Sandras
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