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Cisco Bug: CSCul30254 - Missing RTP sequence numbers when passthrough content is sent on hybrid

Last Modified

Oct 27, 2014

Products (15)

  • Cisco TelePresence MCU 4500 Series
  • Cisco TelePresence MCU 4520
  • Cisco TelePresence MCU 4505
  • Cisco TelePresence MCU 4510
  • Cisco TelePresence MCU 5320
  • Cisco TelePresence MCU 4215
  • Cisco TelePresence MCU 4205
  • Cisco TelePresence MCU 4220
  • Cisco TelePresence MCU MSE 8420
  • Cisco TelePresence MCU MSE 8510
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Known Affected Releases


Description (partial)

When passthrough content is sent in a conference set to hybrid mode there will be about 30-50 packets missed at the beginning of the transmitted stream compared to the stream received by the MCU from the content sender. As it's passthrough content the RTP packets are sent through without being changed by the MCU.

If content is stopped and started by the sender the same thing happens. This has the side effect of wireshark showing packet loss in the content stream to the sender - because there is a gap of 30-50 in the sequence numbers. This is not true packet loss and just a side effect.

This should not cause any noticeable effects in the received content as a keyframe is requested by the content receiver.
Sending passthrough content when using hybrid content mode.
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