Minutes of the [Robustness] telecon on November 17, 1999

Maureen Stillman Maureen.Stillman at NOKIA.COM
Mon Nov 22 09:02:45 EST 1999

In looking at this again, I have to withdraw my previous comments below.

H.225.0 specifies that the encoding of the elements shall follow Q.931.
This would also imply the ordering, as H.225.0 does not specify a different
ordering.  I was mistaken in saying that H.225.0 specifies the ordering-- it
does not.

I will have to concur with Guntram Diehl, who posted a similar comment, that
the tables in H.225.0 do not dictate an ordering of the information elements
and that the ordering is dictated by Q.931.

Now the question is "how important is it that the tables in H.225.0 show the
elements in order"?  Perhaps we should make this change to H.225.0v4.
Aseem, do you feel that this warrants a change in the Implementers Guide?


----- Original Message -----
From: Paul E. Jones <paul.jones at ties.itu.int>
To: <ITU-SG16 at mailbag.cps.intel.com>
Sent: Wednesday, November 17, 1999 9:19 PM
Subject: Re: Problem in Connect Message in H.2250 V3

> Aseem,
> This may be true for Q.931, but H.225.0 modifies the related tables found
> Q.931.  H.225.0 suggests in section 7.2.2 that the encoding shall follow
> rules in Q.931, but H.225.0 specifies the ordering.
> I see no problem with putting those fields at the end, especially
> considering that inserting new IEs in the middle may be more difficult to
> handle.
> It might be interesting to see what assumptions people have made.  Do
> implementation expect an ordering?  Would they expect new elements to be
> ordered numerically or at the end?
> Best Regards,
> Paul
> ----- Original Message -----
> From: Aseem Agarwal <aseem at TRILLIUM.COM>
> To: <ITU-SG16 at mailbag.cps.intel.com>
> Sent: Wednesday, November 17, 1999 5:43 PM
> Subject: Problem in Connect Message in H.2250 V3
> > Hi All
> >
> >  There is a problem in the additions made to Q.931 part of Connect
> >  message in H.2250V3. Two new IEs have been added AFTER User-to-User IE.
> >
> >  The IE codes for the new IEs added are:
> >  Connected Number    : 0x4c
> >  Connected Subaddress: 0x4d
> >
> >  The IE code for User-to-User is 0x7e
> >
> >  According to Q.931 coding Rules [section: 4.5.1], the IEs in a message
> >  should be in ascending order of their respective code values. These two
> >  IEs should be added after Date/Time IE.
> >
> >  Comments ?
> >
> > aseem at trillium.com
> >

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