Which ITU standard enables multiple video streams within a single videoconference?

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Multiple Choice

Which ITU standard enables multiple video streams within a single videoconference?

Dual video streams in a single videoconference are defined by ITU-T H.239, which specifies a second video channel to carry content such as slides or screen sharing alongside the main participant video. This lets attendees see presenter video and shared content at the same time within one session. The signaling context uses H.323 capability exchange (and can be used with SIP-based systems) to negotiate the second video stream’s presence and parameters. The other options do not provide a second video channel: G.711 and G.723 are audio codecs, and GIF is an image format. Therefore, H.239 is the correct choice.

Dual video streams in a single videoconference are defined by ITU-T H.239, which specifies a second video channel to carry content such as slides or screen sharing alongside the main participant video. This lets attendees see presenter video and shared content at the same time within one session. The signaling context uses H.323 capability exchange (and can be used with SIP-based systems) to negotiate the second video stream’s presence and parameters. The other options do not provide a second video channel: G.711 and G.723 are audio codecs, and GIF is an image format. Therefore, H.239 is the correct choice.

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