H.Chat vs. T.Chat: what is best for H.323?

Toby Nixon tnixon at MICROSOFT.COM
Wed Oct 29 18:05:11 EST 1997


I can not even imagine that the 131 as a max. size for UUIE was suitable for H.225.0V1 - was it ? (thinking on the various arguments with its sequences of alias addresses, etc.)

The number 131 comes from the max. length definition of UUIE out of ISDN UU Service 2 and 3.

I agree that we have to extend it in H.225.0V2.

Karl Klaghofer
Siemens AG Munich,      Hofmannstr. 51, D-81359 Munich, Germany
Dptmnt: PN VS LP3,      Building/Room: 1760/455
Tel.:   +49 89 722 31488        Fax.:   +49 89 722 23977
email:  karl.klaghofer at mch.pn.siemens.de


Thanks for the note.

In addition, I have the following corrections:

TimeToLive should be INTEGER(1..4294967295) instead of 4294967296.

With the addition in V2 of supplementary services, fast call setup, and
other items, the length of the User-user IE specified in the tables for
each of the various Q.931 messages should be extended from 2-131 to
something larger (any suggestions?).

The callReferenceValue definition (at least in ARQ) should be modified
to remove the statement that the CRV comes from the Q.931 message.

If you find other needed corrections, please let me know.


Lior Moscovici wrote:
> There are two corrections we would like to suggest in H.225.0:
>    In the Endpoint structure: "destinationInfo" field should be
>    "remoteExtensionInfo". This was our original intent in the Sunriver
>    contribution, but we had a typo, we ourselves overlooked. We apologize
>    for the incovenience. The change has to be reflected in the ASN.1
>    section.
>    In the INAK PDU the field altGkIsPermanent should be OPTIONAL, as it is
>    in all other reject PDUs.
>    Sincerely,
>    Lior Moscovici

Glen Freundlich                           ggf at lucent.com
Lucent Technologies                       office: +1 303 538 2899
11900 N. Pecos                            fax: +1 303 538 3907
Westminster, Colorado 80234  USA

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