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Cisco Bug: CSCup36750 - ISR G2 running CME may crash when registering phones

Last Modified

Apr 16, 2021

Products (2)

  • Cisco 2600 Series Multiservice Platforms
  • Cisco 2600 Series Multiservice Platforms

Known Affected Releases

15.4(1.1) 15.4(3)M

Description (partial)

A software defect exists in IOS internals related to Cisco Unified Communications Manager Express. This can be triggered under two known

- If two phones register to the router at the same time (this is rare)
- If the 'reset' command is issued under the voice register pool to reset connected phones
- Forcing a single IP phone into SRST mode via an ACL (rare)

Once this defect is triggered, one of two symptoms may be observed:
- On ISR G2 platforms which do not support spurious memory accesses (3925E, 3945E), the router will crash and reload. A crashinfo file may be generated.
- On ISR G2 platforms which do support spurious memory accesses (all other models) the router may not crash, but will instead display an ALIGN-3-SPURIOUS error message and traceback in the syslogs.  However, a crash may still be experienced later on.

This will occur while phones are registered to CME if the sip-ua registrar IP address is same as routers IP address. This is a mis-configuration, but it is not expected that the router would crash in this case.
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