Pete,

I fully agree that this feature is needed.

It is available _today_!

The ability to transport standard and manufactures specific (proprietary) features is intrinsic to H.450.1. The term standard includes any ITU or ISO associated standards organization, including regional and national bodies. Using a small envelope, a user can place any information in any H.225.0 message. It includes call independent signaling. It includes the ability to address the message to a node in the call path.

Since this service already exists, I do not see a need for a second implementation.

Bob

------------------------------------------------------------------ Robert Callaghan Siemens Information & Communication Networks Tel: +1.561.997.3756 Fax: +1.561.997.3403 Email: Robert.Callaghan@ICN.Siemens.com ------------------------------------------------------------------

-----Original Message----- From: Pete Cordell [mailto:pete.cordell@BT-SYS.BT.CO.UK] Sent: Thursday, November 12, 1998 3:21 PM To: ITU-SG16@mailbag.cps.intel.com Subject: Mechanisms for Extending H.225.0 without Adding to the Core Protocol

Dear SG16 members,

As usually I have been discussing requirements and uses for H.323 with different people within BT. What I find is they all need different additional features. This represents a problem for H.225, which could easily become as cumbersome as H.245! What is needed is a way to add feature to H.225 without having to add syntax to the core protocol each time. This issue has been particularly brought to a head with the issues relating to handling of SS7.

I have therefore drafted a document that proposes a solution that will allow features to be added H.225 without having to continuously revise the core spec. So far I have only considered the Q.931 side of things, but the RAS side could also benefit from the same treatment.

I have attached this document below for you to look at. The document gives more justification for why this issue urgently needs looking at, so I hope you will find the time to look at it. I know that this is too late as a contribution for this meeting, but I would be interested in discussing it with any interested parties in Torino so that something can be put together for the next meeting.

Regards,

Pete

================================= Pete Cordell BT Labs E-Mail: pete.cordell@bt-sys.bt.co.uk Tel: +44 1473 646436 Fax: +44 1473 645499 =================================