H.323 Annex D

[Paul E. Jones]

Francois,

By default, I believe that editor would be me.  This annex was intended to work with H.323v2 systems and later, but you are correct that there was no way to specify T.38 until H.245v4.

Of course, H.323v2 systems used H.245v3.  H.323v3 systems used H.245v3 or higher (the key element).  So, I suppose the question is: is H.323v3 required?  Surely not, as there are implementations out there.  We have argued about whether H.323v2 systems could use later versions of H.245.  The outcome was "no"-- perhaps that needs to be revisited.

There have been recent changes to H.245 ASN.1 to support T.38.  At least there have been some proposed changes.  Unfortunately, I missed much of that discussion.  The meeting report says that those changes were added to H.245v6.

Mike, is it true that the T.38-related changes from H.245v4 to H.245v6 were nothing more than additions to H.245-- not "changes", per se.  Also, did the proposed changes (from TD8/WP2, I believe) make it into H.245v6?

As for Annex D, I am considering just pulling that into the H.323 document, rather than keeping it as a separately published annex-- does anybody object to that?  That would certainly address questions related to references going forward.  However, we need to reach a decision about the current publication.  I suspect we need something for the IG, but the problem is that H.323v2 is "old news" now.  What to do....

Paul

  ----- Original Message ----- 
  From: Francois Audet 
  To: ITU-SG16 at mailbag.cps.intel.com 
  Sent: Friday, February 25, 2000 1:55 PM
  Subject: H.323 Annex D


  Hi,
   
  I'm not sure who is editor of H.323 Annex D, but...
   
  It seems that there is no reference in Annex D of what version of H.323 and H.245 is required for the procedures to work. There is no way to indicate T.38 or even support of UDP vs. TCP transport in H.245v2.
   
  I think the answer is that H.245v4 or later is required. Perhaps somebody can clarify if this is correct. 
   
  In any case, we definitively need to specify in H.323 Annex D which version of H.245 is required...
  -----
  François Audet  Tel:+1 408 565 5675 mailto:audet at NortelNetworks.com
  Nortel Networks Fax:+1 408 565 2375 http://www.NortelNetworks.com 


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