Question on a NAT traversal requirement

[Paul E. Jones]

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
> ******************************************************************
>