Analysing fast start

Pete Cordell pete.cordell at BT-SYS.BT.CO.UK
Fri Dec 19 06:45:18 EST 1997


Another benefit of using a single TCP connection is that it makes
scaleable gatekeeper farms much easier to implement.  For example, you
can get boxes that will sit in front of multiple HTTP servers to spread
the load.  These use some algorithm to distribute the various TCP
connections.  For H.323, it is likely that with two TCP connections, the
Q.931 TCP connection and the H.245 TCP connection would end up on
different machines.  This makes the design difficult if not impossible!

Pete Cordell
BT Labs
E-Mail: pete.cordell at
Tel: +44 1473 646436
Fax: +44 1473 645499

>From:  Hong Linh Truong[SMTP:hlt at ZURICH.IBM.COM]
>Sent:  19 December 1997 10:38
>Subject:       Re: Analysing fast start
>Without having analysed all the details, I believe Pete's fast start
>approach has the following advantages compared to the one currently
>included in H.323 V2:
>   Having only one TCP connection instead of two not only makes H.323
>   scalable, it also simplifies the coordination and the handling of
>   conditions between Q.931 and H.245.
>   It allows re-use of codes written for the ad-hoc conferencing,
>   it does not change anything to the H.245 procedures, it just moves
>   to the H.225 control channel.
>Hong Linh Truong
>IBM Zurich Research Lab. SMTP:  hlt at
>Saeumerstr. 4            Notes: Hong Linh
>Truong/Zurich/IBM at Zurich@IBM_INTERNAL
>CH-8803 Rueschlikon
>Switzerland              phone: +41 1 724 8434  fax: +41 1 724 8955

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