Guest

Preview Tool

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

Last Modified

Aug 28, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

15.4(1.1) 15.4(3)M

Description (partial)

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

Conditions:
- 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.

Conditions:
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.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.