Most of the work items are grundge work to start with. I'm willing to tackle them until I start to run into issues that need others' comment. How would you like to start on the H.245 abstraction (interface ?:e)?

-----Original Message----- From: Rex Coldren [SMTP:coldrenr@AGCS.COM] Sent: Friday, February 26, 1999 7:36 PM To: ITU-SG16@MAILBAG.INTEL.COM Subject: Re: Development of Decomposed Gateway Architecture

Tom, Sorry to respond so late to this. In the interest of keeping my mailbox close to manageable I deal with the quickies first. Has anyone responded to this or are you taking these work items on yourself? I am wondering whether there is something here that you want me to tackle.

Rex

Tom-PT Taylor wrote:

...

This note is to point out the follow-up work required in the light of the Monterey meeting's adoption of the revised Gateway functional architecture as shown in TD-34 (Monterey). I am prepared to contribute to that work. People may wish to comment on the priorities of definition of the different interfaces.

First point: I followed up Bob Callaghan's pointers to the layer 4 interfaces applicable to our J:c interface (per the TD-34 definition). The relevant references are the SDL charts shown in Annex A of Q.931 and Annex H of Q.764 respectively. These show the messages exchanged over the J:c interface for their respective protocols, but do not show their content. So that's one work item.

Second point: Annex A of Q.931 shows messages going between a Q.931 Protocol Control block and two higher blocks: Call Control and Resource Control respectively. Annex H of Q.764 is more complicated: it shows Call Control above the ISUP User Part, but three blocks within it: Signalling Procedure Control, Call Processing Control, and Circuit Supervision Control. I think we should have a Call Control block in our picture, at the same level as our High-Layer Resource Control. I also think the ISUP Circuit Supervision Control should report into High-Layer Resource Control rather than Call Control.

Third point: the messaging on our ?:b interface can probably be derived from the Q.931 SDL. The content also has to be worked out. Another couple of work items.

Final point: how to determine the content of the ?:e (abstracted H.245) interface and where it should flow? Definitely some detailed work items here.

Tom Taylor E-mail: taylor@nortelnetworks.com (internally Tom-PT Taylor) Tel.: +1 613 765 4167 (internally 395-4167) FAX: +1 613 763 7236 (internally 393-7236)