[h323plus] OpalCall Concept Question

Simon Horne s.horne at packetizer.com
Wed Nov 7 07:24:54 EST 2007


OpenMCU only supports basic H.245 notifications of entry and exit. The H.230
standard interface (which is really made up of H.230/H.243/T.124) extends
that so the member can request and retrieve the full list of members inside
the conference as well as all the conference controls mentioned below. Since
it is all standard H.323 (or generic extensions) it can be deployed mixed
and matched with existing H.323 equipment. There is a standard
conferenceControl capability which is negotiated on connection so if the
endpoint supports conference controls then it can utilise these controls, if
not then the endpoint can still participate in the conference but does not
receive any notifications and operates like an existing OpenMCU member. So
really it's an interoperable functional upgrade of OpenMCU. Giving it far
greater functionality without losing any of it existing deployments or code

Woomera a completely new animal, its a fantastic proprietry add-on solution
and it does solve very important and varied issues way way beyond OpenMCU.

I guess what I'm saying is that the OpenMCU development is incremental and
standard (in the most part) while Woomera is new and proprietry (in the most

Not saying either is better just they are different. :)


-----Original Message-----
From: Craig Southeren [mailto:craigs at postincrement.com]
Sent: Wednesday, 7 November 2007 5:34 PM
To: Simon Horne
Cc: bxg; h323plus at lists.packetizer.com; Opalvoip-devel at lists.sourceforge.net
Subject: Re: [h323plus] OpalCall Concept Question

Simon Horne wrote:
> Craig
> As you are probably aware we will be taking the existing openMCU in a
> slightly different direction. Having the conference controlled from within
> the conference itself. Using the recently added H.230 conference control
> support in h323plus to be able to use H.245 generic messages to assign a
> chair who can invite/eject users, transfer chair controls to others.
> lists can be seen by everyone. A member can be assigned the floor who has
> limited control like being able to takeover the MCU display and switch the
> video input from the primary video to the secondary app share input for
> presentations. Since this developed with the existing openMCU,
> implementations should be able to migrate/upgrade to include these new
> features.

Not sure why you think it is different. OpenMCU already has low level
support for some of the H.245 conference control messages to implement
these functions

And I'm already implementing these kinds of functions in the
Woomera-based MCU


 Craig Southeren          Post Increment ¨C VoIP Consulting and Software
 craigs at postincrement.com.au                   www.postincrement.com.au

 Phone:  +61 243654666      ICQ: #86852844
 Fax:    +61 243656905      MSN: craig_southeren at hotmail.com
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 "Science is the poetry of reality." Richard Dawkins

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