Documents for the next week meeting of Q.1

Patrick Luthi patrick.luthi at ties.itu.ch
Wed Aug 23 03:28:54 EDT 2006


Paul,
I would like to emphasis that this is true only for Nat traversal based
on H.460 (17, 18, 19) and not to other means of NAT traversal
Roni Even

> -----Original Message-----
> From: Paul E. Jones [mailto:paulej at PACKETIZER.COM]
> Sent: Wednesday, August 23, 2006 7:18 AM
> To: 'OKUBO Sakae'; itu-sg16 at external.cisco.com
> Subject: RE: Question on a NAT traversal requirement
> 
> Mr. Okubo,
> 
> Given this wording, I would say the answer to your question is "it MAY
> work
> with H.323v1 or H.323v2, but SHALL work with H.323v3, v4, v5, v6, ..."
> 
> In reality, I don't believe v1 systems can be supported, since H.323v1
> systems were required to use H.245v2.  H.323v2 lifted this
restriction, so
> devices could implement later versions of H.245 approved independently
of
> H.323.
> 
> Paul
> 
> > -----Original Message-----
> > From: OKUBO Sakae [mailto:okubo at MXZ.MESH.NE.JP]
> > Sent: Tuesday, August 22, 2006 4:10 AM
> > To: itu-sg16 at external.cisco.com
> > Subject: Question on a NAT traversal requirement
> >
> > Dear NAT traversal experts,
> >
> > TTC (The Telecommunication Technology Committee) is now working on
> > Technical Paper "Requirements for Network Address Translator and
> > Firewall Traversal of H.323 Multimedia Systems" to convert it to a
> > Technical Report in Japanese language.
> >
> > I have a question on how to interpret the following part:
> >
> > ----------
> > 9.3	Requirements on Signalling and Media Streams
> > b)	NAT traversal mechanisms for H.323 multimedia systems shall
> > support no less than ITU-T H.323v3, H.245v7, H.225.0v4, and H.235v3.
> > All later versions of H.323, H.245, H.225.0 and H.235 may be
> > supported.
> > ----------
> >
> > Take an example of H.323 that has now v6. Which of the following
> > statements are true?
> >
> > NAT traversal
> >
> > 1/ shall not support v1 or v2.
> > 2/ may support v1 or v2.
> > 3/ shall support v3.
> > 4/ shall support v3 and in addition may support any combinations of
> > v4, v5 and v6.
> > 5/ shall support v3 and may support v4, or (v4 and v5), or (v4, v5
and
> > v6).
> >
> > In other words, NAT traversal with the following support conforms to
> > this requirement:
> >
> > a/ v3
> > b/ v4
> > c/ v5
> > d/ v6
> > e/ v3, v4
> > f/ v3, v5
> > g/ v3, v6
> > h/ v3, v4, v5
> > i/ v3, v4, v5, v6
> > j/ v4, v5
> > k/ v4, v6
> > l/ v4, v5, v6
> > m/ v5, v6
> >
> > --
> > Best regards,
> >
> > OKUBO Sakae
> > e-mail: okubo at aoni.waseda.jp
> >          (<== sokubo at waseda.jp, valid until 31 March 2007)
> > Visiting Professor
> > Global Information and Telecommunication Institute (GITI)
> > Waseda University
> > ******************************************************************
> > Waseda University, YRP Ichibankan 312        Tel: +81 46 847 5406
> > 3-4 Hikarinooka, Yokosuka-shi, Kanagawa-ken  Fax: +81 46 847 5413
> > 239-0847 Japan
> >                        H.323 videoconferencing: arranged by advice
> > ******************************************************************
> >





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