Question on a NAT traversal requirement

[Even, Roni]

Mr. Okubo,

This statement is there since the in order to allow solutions that will
require the extensibility framework and generic parameters defined only
from those versions. 
This means that any version from this version and above will work. It
also means that NAT traversal may work with older systems using other
NAT traversal mechanisms like Session Border Controllers or ALGs

Roni Even

> -----Original Message-----
> From: OKUBO Sakae [mailto:okubo at MXZ.MESH.NE.JP]
> Sent: Tuesday, August 22, 2006 11:10 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
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