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Cisco TelePresence MCU 4200 Series

Endpoint shows H.264 for transmit and H.263 for receive when connected to an MCU

Why does my endpoint show H.264 for transmit and H.263 for receive when connected to a Cisco TelePresence MCU?

The Cisco TelePresence MCU will change the resolution and the codec being sent to an endpoint to try to produce the best image based on the capabilities of the endpoint being used. In particular there are several endpoints which can support H.264 at CIF resolutions, but at 4CIF they can only support H.263 - and often only at 15 frames per second.

For any given view that an endpoint is seeing, the MCU will dynamically change the resolution and the codec to optimize the video quality. For example, switching from a continuous presence layout to a full screen voice-activated layout will often cause the MCU to switch between sending H.263 at 4CIF to sending H.264 at CIF.

This article applies to the following products:

  • Cisco TelePresence MCU 4200 Series
  • Cisco TelePresence MCU 4500 Series
  • Cisco TelePresence MCU 5300 Series
  • Cisco TelePresence MCU MSE Series

October 2nd, 2013 TAA_KB_62