H.248 Annex C Codepoint Information

Christian Groves Christian.Groves at ERICSSON.COM
Mon May 8 20:42:05 EDT 2000


G'Day John,

In the binary Annex C already has a packageID '0'. If people want a
package name then I'm not adverse to that.

My second point was that new packages could redefine the parameters in
an appropriately grouped package. This way we get over the problems
associated with a Q.931v7 problem Tom was alluding to. Annex C was a
toolkit of parameters that could be used in the early stages of the
protocol.

To achieve true interoperability for applications and symmetry between
text and binary I believe that Profiles containing packages and options
is the only way to go.

Cheers, Christian

John Segers wrote:
>
> Hi,
>
> I was going to say the same thing as Christian (but strange telephone
> sockets in the UK kept me from doing so): if a reference is provided,
> the values listed in the value column serve as examples only; normative
> text is in the references as indicated at the start of the annex.
>
> The second point Christian mentioned is an interesting one.  Is the idea
> that if one defines a package for which there is already an annex C
> codepoint, the package would just refer to that instead of defining a
> new codepoint?  If that is the intention, we'd better give annex C a
> package name...
>
> Cheers,
>
> John
>
> Christian Groves wrote:
> >
> > Hello Tom,
> >
> > References are included in Annex C and the text at the start says that
> > the reference is the normative text. I personally would envision that
> > most changes to codepoints would be contained in packages. ie. if we use
> > packages for defining properties then we align the text and binary
> > encodings of H248. That way we don't need to continuously update SDP and
> > Annex C to match.
> >
> > Regards, Christian
> >
> > Tom-PT Taylor wrote:
> > >
> > > H.248 Annex C is by concept derivative in nature -- it provides the means to
> > > reuse codepoints from a variety of other standards.  As it currently stands,
> > > it reproduces these codepoints in the "Value" column.  I am concerned that
> > > this could present a maintenance nightmare.  It would make more sense to
> > > point the user to the specific reference in the other standard and leave it
> > > at that.
> > >
> > > Tom Taylor
> > > Phone and FAX: +1 613 736 0961
> > > E-mail: taylor at nortelnetworks.com
> >
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>
> --
> John Segers                                  email: jsegers at lucent.com
> Lucent Technologies                                        Room HE 306
> Dept. Forward Looking Work                      phone: +31 35 687 4724
> P.O. Box 18, 1270 AA  Huizen                      fax: +31 35 687 5954
>
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