Paul,
While not ideal (nothing is), that's a safe, workable solution. I like it. Are you proposing adding the new component to the H323-UU-PDU or the Setup-UUIE type? Both locations have their merits. This then should be the new text for section 8.2.1/H.323: "The calling endpoint shall not include both a fastStart element and encapsulated H.245 messages in h245Control in the same Setup message. However, the calling endpoint may include both a fastStart element and encapsulated H.245 messages in earlyH245Control in the same Setup message." And then explain what the called endpoint is supposed to do when fastStart and earlyH245Control are present. While we're at it, maybe we should define a separate type, i.e.,
H245Control ::= SEQUENCE OF OCTET STRING OPTIONAL -- each octet string may contain exactly -- one H.245 PDU
But now how do the two components, h245Control and earlyH245Control otherwise relate to each other, i.e., when fastStart is not included? Should we say that if one is present the other shall not be present? That would be the clearest, IMO. Not much is gained by allowing both.
Remember, the first rule of standards revision is (everybody repeat after me)... "Primum non nocere" ("First do no harm.") - the Roman physician, Galen
Paul Long Smith Micro Software, Inc.
-----Original Message----- From: Paul E. Jones [mailto:paulej@PACKETIZER.COM] Sent: Friday, June 02, 2000 8:14 PM To: ITU-SG16@MAILBAG.INTEL.COM Subject: Re: On TD26 - Fast TCS and M/S negotiation in H.323v4
Francois,
I agree that the behavior is desirable, but I still argue that it will break backward compatibility. If we can agree with a new field "earlyH245" as a special field for SETUP to do essentially the same thing, but only for V4, I would be quite happy-- we get the same end result without V3 and V2 compatibility issues.
I do not want to wait until Portland. The Whitepaper drafts are due before then and I hope that that meeting will be focused on only critical issues in H.323 and that most of our time will be spent on further development of Annexes and perhaps forward thinking on V5 :-)
Paul
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