Cisco ISDN GW 3241 Manual de usuario descargar pdf (Pagina 55)

Chapter 9 Using data

Introduction

For each conference you can use an additional video channel known as the content channel which uses the

H.239 protocol. Typically the content is high resolution, but with a low frame rate for example, for

showing a slide presentation. When this feature is used there may be three media streams between the

MCU and each H.323 endpoint: the main video (the normal multi-pane view), audio and the H.239 video

content (the content channel).

There are a number of differences between the main video and the content channel — see the online help

topic “H.239 (content channel video) support”. The most important of these is that there can be only one

content channel per conference. Therefore if one endpoint is contributing the content channel, another

endpoint cannot start to contribute data until the first one stops.

This content channel feature encompasses:

 Sourcing the content channel from a H.323 endpoint's H.239 video stream or a VNC connection

 H.239 video streams sent from the MCU to viewing H.323 endpoints

 Streaming the content channel to users' desktop machines

 Allowing graphical and textual "markup" of the content channel*

 Text chat between conference participants*

Configuring content channel support

The content channel support is controlled at three levels — see the online help topic “H.239 (content

channel video) support”:

 Box wide:

MCU-wide. Go to Settings > H.239 and see the online help topic “Configuring H.239 settings”

IP VCR-wide. Go to Settings > H.239 and see the online help topic “Configuring H.239 settings”

* These features require web conferencing feature key to be installed. See “Using additional

options (features keys)” on page 70.

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Cisco ISDN GW 3241 Manual de usuario Pagina 55