This article relates to the Cisco TelePresence MCU 4203, Cisco TelePresence MCU MSE 8420, Cisco TelePresence IP VCR 2210, Cisco TelePresence VCR MSE 8220, Cisco TelePresence ISDN GW 3241, Cisco TelePresence ISDN GW MSE 8321, Cisco TelePresence IP GW 3510, Cisco TelePresence MCU 4505 and Cisco TelePresence MCU MSE 8510 products.
Q. How can I enable dual video, duo video, people and content, or H.239 on my Codian product?
A. Dual video, Duo Video, People + Content and H.239 are all terms that describe support for a second live video channel in an H.323 call. Such a channel is most often used for the transmission of content, like the screen of a presenter's PC (so the term 'content channel' is also used). The terms all have slightly different meanings. Dual video is a generic term describing this capability. Duo Video and People + Content are proprietary implementations from TANDBERG and Polycom respectively. H.239 is the ITU standard for a second video channel; this is supported by all the major vendors, and is the only content channel standard supported by Codian products on H.323 video calls.
Codian products need to be configured to enable H.239. Any H.323 endpoint that also supports the H.239 protocol can source this channel, as can a VNC connection, though some endpoints need to be configured to use H.239 instead of their proprietary solution.
To use H.239 in a conference on a Codian MCU you need to first enable H.239 status on the MCU device-wide in the Settings > H.239 page. Then, when you configure the conference, make sure it is enabled for H.239 (set H.239 content channel video to Enabled). Additionally, if you use pre-configured participants, you also need to enable each endpoint that you want to use as an H.239 source by setting H.239 video contribution to Enabled for that endpoint.
See the online help topic H.239 (content channel video) support which explains the features of this channel, its sources and how to enable H.239 on an MCU.