On TD26 - Fast TCS and M/S negotiation in H.323v4

Paul E. Jones paulej at PACKETIZER.COM
Wed May 31 23:13:56 EDT 2000


Paul,

We agreed at the Osaka meeting to allow a SETUP to contain both the
fastStart and h245Control, but it has not been officially approved by the
ITU.

As it stands right now, I don't think I can agree to include it in H.323v4
on the grounds that it breaks backward compatibility with V2-- I just don't
see a clean solution here.

I'm opening to hearing more suggestions, but as you pointed out, there are
two issues:
  1) H.323v2 states explicitly that it is illegal
  2) There is no way to know what version to destination EP is before
     sending this illegal message

Paul

----- Original Message -----
From: "Paul Long" <Plong at SMITHMICRO.COM>
To: <ITU-SG16 at mailbag.cps.intel.com>
Sent: Wednesday, May 31, 2000 10:34 AM
Subject: Re: On TD26 - Fast TCS and M/S negotiation in H.323v4


> Pete,
>
> Table 13/H.225.0v3 shows that the User-to-User IE is mandatory. What IEs
do
> you believe are not mandatory?
>
> H.323 states that the fastStart and h245Control components cannot both be
> present in the Setup message (do I need to quote it again?). A Setup
> User-to-User IE containing either or neither component is valid; one
> containing both is clearly invalid. Why do you think otherwise?
>
> H.323, by way of Q.931, requires that the called EP respond with
> ReleaseComplete with cause 100. There is no other appropriate cause.
>
> The feature that should be deprecated is the inclusion of both fastStart
and
> h245Control in Setup. I was under the impression that either through IGv3
or
> H.323v4 this had already made it into the standard. If its not too late,
we
> should simply remove this feature from any proposed text; if it is too
late,
> we should deprecate it because it causes insurmountable backward
> compatibility problems.
>
> Paul
>
> -----Original Message-----
> From: Pete Cordell [mailto:pete at TECH-KNOW-WARE.COM]
> Sent: Wednesday, May 31, 2000 4:31 AM
> To: ITU-SG16 at MAILBAG.INTEL.COM
> Subject: Re: On TD26 - Fast TCS and M/S negotiation in H.323v4
>
>
> Paul,
>
> I don't really believe that the release cause you cite is valid.  The
> IEs
> are not mandatory, and (taken by themselves) they don't have invalid
> content.  I don't believe it is the intent of this cause code to signal
> the
> sort of thing that we are talking about here either.
>
> Are there any other causes and clauses that you think might be more
> appropriate?
>
> Also, when you say "the feature" should be deprecated, what are you
> referring to as "the feature"?  I'm not quite clear.
>
> Pete.
>
> =============================================
> Pete Cordell
> pete at tech-know-ware.com
> =============================================
>
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