help in creating WhiteBoard application using Opal

FYI opal is now opalVoIP and openH323 is continuing on as
H323plus. OpenH323
(the project "in general" is no longer being
actively developed.

T.120 support in Opal is at the same level it as it is in
OpenH323 very very
basic.

There is a project on sourceforge which has been abandoned
for many many
years based on OpenH323.
http://sour
ceforge.net/projects/opent120/

T.120 development in general has pretty much stopped for
various reasons
including NAT issues. It uses TCP and you cannot easily use
STUN,
H.460.18/19 or emerging NAT technologies like P2Pnat to
traverse NATs.

That does not mean T.120 development has ceased.

In h323plus www.h323plus.org we have added H.239 support or
extended video
to perform the same operation as T.120 app/whiteboarding
would perform
except over UDP so it can traverse NATs. It utilises the
existing video
plugin codecs to create a secondary video channel for the
purpose of App
Sharing. This work is continuing with the addition of app
sharing controls
such as H.249 collaberaton controls (remote userinputs,
mouse movements and
keystrokes).

T.124 or Generic conference controls has also been
resurrected and is being
tunnelled through H.245 to perform "next
generation" remote MCU control
functionality such as Inviting and ejecting participants,
Floor and chair
controls and eventually the ability to introduce H.239 apps
directly into
conferences as presentations.

If anyone would like to participate and/or contribute to
this work then
please let me know.

Simon


 -----Original Message-----
From: openh323-devel-bounceslists.sourceforge.net
[mailto:openh323-devel-bounceslists.sourceforge.net]On
Behalf Of Vishak V.
Kurup
Sent: Monday, 29 October 2007 3:08 PM
To: openh323-devellists.sourceforge.net
Subject: [Openh323-devel] help in creating WhiteBoard
application using Opal



Hi,
            I am Vishak. I want to develop a white board
application for
linux using gtk. I heard that whiteboard applications use
T.120 protocol.
T.120 protocol is in the stack of Opal. So can any one
please tell me how
create a whiteboard application.

 Regards




------------------------------------------------------------
-------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems?  Stop.
Now Search log events and configuration files using AJAX and
a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/
_______________________________________________
Openh323-devel mailing list
Openh323-devellists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/openh323
-devel

Simon, Vishak,

If there was interest to address the NAT/FW issues in T.120,
it would
certainly be possible.  We would need to change the T.123
layer (transport
specification) to enable, for example, transport via UDP,
DTLS, or similar.
The other alternative would be to employ TCP relay servers
in public
networks, which I suspect would not be preferred.  The
problem is that
applications like app sharing can consume a lot of
bandwidth, all of which
would be flowing through that box.

In any case, the biggest problem T.120 faced, in my opinion,
was not
firewalls, but simply the business model.  T.120 requires
installation of
software on the PC to provide functionality that one can do
with a web
browser.  For whatever reason, people preferred not to have
to install
software.  However, that mentality is now changing since
folks are
installing software for voice, anyway.

The other hurdle was that Microsoft released NetMeeting,
which used T.120.
It was extremely hard for any company to justify creating a
product in that
market space when Microsoft was giving it away for free. 
Now that MS is no
longer giving it away for free with Vista, perhaps it opens
the door of
opportunity again?

Paul

> -----Original Message-----
> From: h323plus-bounceslists.packetizer.com
[mailto:h323plus-
> bounceslists.packetizer.com] On Behalf Of Simon Horne
> Sent: Tuesday, October 30, 2007 12:49 AM
> To: Discussion on enhancements and development issues
with the OpenH323
> library
> Cc: H323plus
> Subject: Re: [h323plus] [Openh323-devel] help in
creating WhiteBoard
> application using Opal
> 
> 
> FYI opal is now opalVoIP and openH323 is continuing on
as H323plus.
> OpenH323
> (the project "in general" is no longer being
actively developed.
> 
> T.120 support in Opal is at the same level it as it is
in OpenH323 very
> very
> basic.
> 
> There is a project on sourceforge which has been
abandoned for many
> many
> years based on OpenH323.
> http://sour
ceforge.net/projects/opent120/
> 
> T.120 development in general has pretty much stopped
for various
> reasons
> including NAT issues. It uses TCP and you cannot easily
use STUN,
> H.460.18/19 or emerging NAT technologies like P2Pnat to
traverse NATs.
> 
> That does not mean T.120 development has ceased.
> 
> In h323plus www.h323plus.org we have added H.239
support or extended
> video
> to perform the same operation as T.120
app/whiteboarding would perform
> except over UDP so it can traverse NATs. It utilises
the existing video
> plugin codecs to create a secondary video channel for
the purpose of
> App
> Sharing. This work is continuing with the addition of
app sharing
> controls
> such as H.249 collaberaton controls (remote userinputs,
mouse movements
> and
> keystrokes).
> 
> T.124 or Generic conference controls has also been
resurrected and is
> being
> tunnelled through H.245 to perform "next
generation" remote MCU control
> functionality such as Inviting and ejecting
participants, Floor and
> chair
> controls and eventually the ability to introduce H.239
apps directly
> into
> conferences as presentations.
> 
> If anyone would like to participate and/or contribute
to this work then
> please let me know.
> 
> Simon
> 
> 
>  -----Original Message-----
> From: openh323-devel-bounceslists.sourceforge.net
> [mailto:openh323-devel-bounceslists.sourceforge.net]On
Behalf Of
> Vishak V.
> Kurup
> Sent: Monday, 29 October 2007 3:08 PM
> To: openh323-devellists.sourceforge.net
> Subject: [Openh323-devel] help in creating WhiteBoard
application using
> Opal
> 
> 
> 
> Hi,
>             I am Vishak. I want to develop a white
board application
> for
> linux using gtk. I heard that whiteboard applications
use T.120
> protocol.
> T.120 protocol is in the stack of Opal. So can any one
please tell me
> how
> create a whiteboard application.
> 
>  Regards
> 
> 
> 



------------------------------------------------------------
-------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems?  Stop.
Now Search log events and configuration files using AJAX and
a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/
_______________________________________________
Openh323-devel mailing list
Openh323-devellists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/openh323
-devel