Reference; Content Channel Support - Cisco TelePresence 7010 Help Manual

Reference

Content channel support

Most telepresence endpoints support the use of a second video channel known as the content channel.
Typically this is used for presentations running alongside live video.
H.323 systems use a protocol called H.239 to receive and send the content channel video.
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SIP systems use a protocol called BFCP for content.
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Cisco CTS systems and other TIP systems use TIP to control content sharing.
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The TelePresence Server caters for endpoints that do not support the second video channel by allowing
content in main video. When this feature is enabled the TelePresence Server sends the content in the main
video channel to those endpoints. The content channel is composed with the normal video while the content
channel is active (content is displayed in the largest pane and other participants' video streams are centered
continuous presence panes across the bottom of the display).
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