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Cisco Bug: CSCup51386 - RT-lite Phones:All 69XX phones unregister and re register randomly

Last Modified

Nov 27, 2020

Products (11)

  • Cisco SIP IP Phone Software
  • Cisco Unified SIP Phone 3905
  • Cisco Unified IP Phone 9951
  • 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 models affected 
Firmwares tested: 9-3-3-2, 9-3-3-2SR1, 9.2.4, 9.2.2, 9.4.1

Other phone models not impacted

The phone reset happens every 12 and half or 25 hours. And the pattern is continuous. If a phone resets at time X. Then next it will reset at X+12.5 or X+25 hours correctly and will register back. Where a2 or 25 is the value of the DHCP lease time which has been currently set.

The reason device has unregistered will be  with Reason=8 which is the following 
DeviceInitiatedReset - The device has initiated a reset, possibly due to a power cycle or internal error. No action required; the device will re-register automatically. As seen the devices register back on the same second itself.

From the phone captures while the phone is restarting you can see that it is renewing its DHCP-lease and then restarts.The issue is related to the DHCP-lease renew procedure.
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Bug Details Include

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