Resend: T.120/H.323 Harmonization problems

7 Jan 1998


      This is a re-transmission of an E-mail that I sent yesterday concerning
problems with the T.120/H.323 harmonization changes.  I understand that some
people were not able to read the attachment from yesterday's mail.  I have
attached it unzipped and with a short file name this time (it's only 18K).
If you got it OK the first time, then you can ignore this E-mail (it's
identical).
I strongly encourage anyone with an interest in this subject to review this
material and report any issues or concerns by the end of the week.  The
delta documents must be submitted by Monday of next week.
Below is the original E-mail.
Thanks again.
Pat Galvin
pgalvin@DataBeam.com
-----Original Message-----
Recent conversations have exposed some problems with the T.120/H.323
harmonization changes that were made in Sunriver (mainly related to Gateway
compatibility).  Attached is a document that details the wording changes
required to resolve these problems.
We realize that it is very late in the process, but these are real issues
and we'd like to get them resolved if at all possible.  Gary Thom has
indicated to me that if there is general agreement to these changes, they
can be included in the change document being submitted as a Delayed
contribution.
The problems are as follows:
1.  When communicating through a "smart" Gateway to an H.320 MCU, it is
possible for the H.323 node to get a "waitForInvite" from the Gateway.
However, the current text does not guarantee that the Gateway will have the
transport address of the H.323 node.  To fill this hole, the H.323 node MUST
provide its transport address in the OLC if it is the slave (this will never
happen if the node is the master).
2.  When communicating through a "pass-through" Gateway to an H.320 node, it
will sometimes be necessary for the Gateway to dictate how the call should
be made.  Therefore, the new text allows the responder to override the
recommended setup procedure by ignoring the transport address in the OLC
(and sending a transport address back in the OLC Ack).
3.  The current t120SetupProcedure choices are not accurate.
issueQueryAndJoin should really be just issueQuery (since it may be
necessary to respond with something other than Join).  issueCreate is not
necessary, since conference creation is an implicit part of the OLC
procedures.  There is no need to differentiate between issueJoin and
issueInvite, since master/slave determination indicates the required
hierarchy.  And finally, waitForInvite is only useful when the initiator is
the slave.  By using a more generic name, it could be useful regardless of
who initiates the OLC (it can be interpreted as either wait for invite OR
wait for join, depending on M/S).  In summary, the suggested
t120SetupProcedure choices are: originateCall; waitForCall; and issueQuery.
For more details on the exact suggested changes, please review the attached
document.
Thank you for your consideration.
------------------------------------
Pat Galvin
pgalvin@DataBeam.com
Phone: +1-910-854-3551
Fax: +1-910-854-1983
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