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Cisco Bug: CSCum26309 - Intermittently phone unregisters after long duration stress test

Last Modified

Feb 08, 2017

Products (11)

  • Cisco Unified IP Phones 9900 Series
  • Cisco Unified IP Phone 9951
  • Cisco Unified SIP Phone 3905
  • Cisco Unified IP Phone 6941
  • Cisco Unified IP Phone 6961
  • Cisco Unified IP Phone 8961
  • Cisco Unified IP Phone 8945
  • Cisco Unified IP Phone 8941
  • Cisco Unified IP Phone 9971
  • Cisco Unified IP Phone 6945
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Known Affected Releases


Description (partial)

phone state turns to "unregistered" after long duration stress test.

3 phones named A,B.C

all the lines on A &C Enable "Auto Answer": "Auto Answer with Speaker"

Test procedure:
1)B call A, then A end call 
2)A call C, then C end call
repeat 1-2. Calls per minute is 20.

Intermittently phone C's state turn to "unregistered" then power cycle itself and re-register after above stress call test run over 12 hours even longer.
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