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Beginner

Video Conferencing and Content Sharing (Presenting)

Hi, guys.

I'm interested in video conferencing and  content sharing at the same time. How is the whole thing made? From what  I've found in the internet I saw that the protocol that is used is  H.239 over H.323, but basically that's all I found.

Are  there several types of sharing content? Are the voice and video sharing  the same stream with the content? Is the content available only on  another screen or it can be mixed with the video in the same screen? Is  there a place where can see a sample call flow of the whole operation?

Thanks,

Kiril

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Cisco Employee

Re: Video Conferencing and Content Sharing (Presenting)

There is several method for content share.

SIP: BFCP (open two video channels, one for main video and other for content video channel).

H.323: H.239 (open two video channels, one for main video and other for content video channel).

Also TIP for sending multiple video stream in same video channel.

BFCP/H.239 is common method for sending content channel.

It open two video channels and sending video stream separately but usually audio will mix (mix audio from microphone and other input like DVD audio a part of content sharing).

Basic call flow (in most common method) for H.239 is…,

  1. Endpoint request H.239 token
  2. Far end device (Endpoint while in point-to-point call or MCU while in multi sites call) grant H.239 token
  3. Endpoint close main video channel and re-CapSet negotiation
  4. Open main video channel and content video channel (usually split original main video channel bandwidth in 50%/50% to two video channels)

Addition to above content sharing method, Cisco TelePresence MCU support content sharing on main video channel (MCU mix content video channel into one of video panel in main video stream) for Endpoint doesn’t support 2nd video capability.

Highlighted
Enthusiast

Re: Video Conferencing and Content Sharing (Presenting)

Excellent summary Tomo.

Thanks,

Amir

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