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Cisco Bug: CSCtb77593 - router crashes when RTP loop exists in IPIPGW environment

Last Modified

Jan 28, 2017

Products (73)

  • Cisco IOS
  • Cisco 2951 Integrated Services Router
  • Cisco AS5400XM Universal Gateway
  • Cisco VG204 Analog Voice Gateway
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 1812 Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 878 Integrated Services Router
  • Cisco 1803 Integrated Services Router
  • Cisco VG224 Analog Voice Gateway
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Known Affected Releases

12.4T 15.1(1)T

Description (partial)


A Cisco IOS VoIP gateway configured for IPIPGW (CUBE) functionality may crash.


A gateway configured for IPIPGW functionality with the command <CmdBold>allow-connections<noCmdBold> under <CmdBold>voice service voip<noCmdBold> under rare conditions will crash while processing VoIP calls.  

This has been found to occur in some scenarios where a single voip call loops (meaning the call is from the IPIPGW back to the same IPIPGW) through the IPIPGW.

When this occurs, the following error message may be noticed:

%SYS-6-STACKLOW: Stack for process IP Input running low, 0/12000
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