RE: [Sip] about H.323 and SIP

Michael,

No, the pregranted ARQ is part of the registration process and is not
involved with call setup. Let me say it again, call setup can be
accomplished with a single message, so H.323 is no different than SIP in
this regard.

Also, H.323 and SIP have influenced each other, so it's not by any means a
one-way street.

Paul Long
ipDialog, Inc.

-----Original Message-----
From: sip-admin@ietf.org [mailto:sip-admin@ietf.org]On Behalf Of Michel
A. Maddux
Sent: Friday, September 14, 2001 9:52 AM
To: 'Paul Long'; sip@ietf.org
Subject: RE: [Sip] about H.323 and SIP

Paul Long writes:

If the H.323 endpoint is unregistered or uses the direct call model and
pregranted ARQs, only a single message (Setup) is necessary in H.323 to
setup a call.
--------------

Hmmm, and yet, the need to have the pre-granted ARQ is part of the call
setup
sequence... and in fact, depending upon exactly how the Gatekeeper bandwidth
management is provided, could itself cause some problems.  For example, if
1000 endpoints all request a pre-granted ARQ (this is after registration
sequence
and etc...), and the Gatekeeper allows only 1000 calls - no calls are in
progress at that time, and yet the gatekeeper could disallow the next
request.

Clearly, pre-granted ARQ and Fast Start are examples of the changes to the
original H.323 spec which were specifically designed to address the issues
of excessive message traffic.  My comment to Lina in the original post was
not intended to describe the many intricacies of the two protocols (because
I believe that they both have a place in the industry), rather to point out
what I believe to be the fundamental difference between them - pursuant to
the question.

thanks. /m.

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