Sorry, it's too late to comment on this. Annex E was approved in Santiago. I assume it will be available for ordering from ITU at some point. The final draft may be available on the picturetel avc site. Chip P.S. I noticed that I did not select Reply all when replying to the mail, but it is sending it to the list anyway. Chip At 03:19 PM 9/30/99 -0700, you wrote:

Hi All,

I have a few concerns about H.323 Annex E proposed document. My reference is the "Proposed changes to H.323 Annex E" document which was presented at Santiago meeting of SG13/16.

Section E.1.3.2 states Serial Model. It says that Annex E stack will wait until a positive reply is returned * for the same Session-Identifier *. This means that an outgoing Annex E PDU can only contain multiple payloads of the same session only. Second, it implies that the sequence number (which is present in Annex E PDU header) must be unique now across < sender host+port, rcv host+port, session-id>.

We can not make sequence number unique across <sender host+port, rcv host+port> only, because the message sequences should be blocking only for same session-identifier, as stated by the NOTE appended below section E.1.3.2.

The Annex E Ack message, however, only contains the sequence number of Annex E PDU. How can the sender of an Annex E PDU will distinguish for what session's PDU this ack has come for? Because sender might have sent Annex E PDUs with the same sequence number for different sessions over a given < sender host+port, rcv host+port>.

Am I missing something here. I will appreciate any clarifications on the above.

regards, Manoj Paul.

-------------------------------------------------- Chip Sharp Consulting Engineering Cisco Systems Telco Bio-region Reality - Love it or Leave it. --------------------------------------------------