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Cisco Bug: CSCur27150 - MCU internal DSP network lockup

Last Modified

Sep 17, 2019

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 4203
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Known Affected Releases

4.5(1.45) unspecified

Description (partial)

In very rare circumstances a TelePresence MCU 8510 series may unexpectedly reboot whilst processing calls.


This type of reboot is caused by a build up of messages on the internal network of the MCU used for communication between media resources. The exact cause of this build up of messages has not been identified. Whilst this type of crash has been observed in several cases, there has been no linking factor between them and no case has ever been observed in the same environment more than once.

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Bug Details Include

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