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Cisco Bug: CSCuo17030 - Content channel flow controlled to a higher bandwidth than all endpoints

Last Modified

Jan 24, 2016

Products (15)

  • Cisco TelePresence MCU 4500 Series
  • Cisco TelePresence MCU 4520
  • Cisco TelePresence MCU 4505
  • Cisco TelePresence MCU 5320
  • Cisco TelePresence MCU 4510
  • Cisco TelePresence MCU 4215
  • Cisco TelePresence MCU 4205
  • Cisco TelePresence MCU 4220
  • Cisco TelePresence MCU MSE 8420
  • Cisco TelePresence MCU 4203
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Known Affected Releases


Description (partial)

Symptom: When a high bandwidth TC endpoint (>1Mbps) and another low bandwidth endpoint joins an MCU conference, if the TC endpoint starts to send content, the MCU may flow control the content channel multiple times to adjust it to the bandwidth of the low-bandwidth endpoint. However, since TC endpoint uses different codecs for different bandwidth (H.263 for >512Kbps and H.264 for <512Kbps), this can result in TC endpoint repeatedly closing and opening the content channel with different codecs. As a result, the rest of the participant receiving content can experience fluctuating content as well. 
Condition: TC endpoint is the content contributor in the MCU conference and there is a difference in bandwidth between different participants in the conference.
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