I believe I have ran into this on 12.5 CUCM also with 12.5.3 firmware on 8851. Hardware revision of phone is v04.
Unless this is the task that prevents the memoryleak issue ... ? It is not really clear to me.
7752 NOT Feb 24 11:17:04.798046 (668:825) JAVA-callagent MQThread|cip.callagent.CallAgent$2:? - resetData:resetState:NO_RESET registrationState:PAUSE dhcpOption:DHCP_FAST deadIpStack:-1showDefer:true, requested:false, pending:false, paused:true
7753 NOT Feb 24 11:17:04.798175 (668:825) JAVA-callagent MQThread|cip.callagent.CallAgent$2:? - resetData:resetState:SOFT_RESET_REQUESTED registrationState:PAUSE dhcpOption:DHCP_FAST deadIpStack:-1showDefer:true, requested:true, pending:false, paused:true
7754 NOT Feb 24 11:17:04.798420 (668:852) JAVA-upgradereboot MQThread|cip.urui.UpgradeReboot$1:? - statusChanged() called resetData: resetState:NO_RESET registrationState:PAUSE dhcpOption:DHCP_FAST deadIpStack:-1showDefer:true
7755 NOT Feb 24 11:17:04.798500 (668:852) JAVA-upgradereboot MQThread|cip.urui.UpgradeReboot$1:? - statusChanged() called resetData: resetState:SOFT_RESET_REQUESTED registrationState:PAUSE dhcpOption:DHCP_FAST deadIpStack:-1showDefer:true
7756 NOT Feb 24 11:17:04.798624 (668:854) JAVA-memoryleakreboot MQThread|cip.urui.MemoryLeakReboot$1:? - statusChanged() called resetData: resetState:NO_RESET registrationState:PAUSE dhcpOption:DHCP_FAST deadIpStack:-1showDefer:true
7757 NOT Feb 24 11:17:04.798699 (668:854) JAVA-memoryleakreboot MQThread|cip.urui.MemoryLeakReboot$1:? - statusChanged() called resetData: resetState:SOFT_RESET_REQUESTED registrationState:PAUSE dhcpOption:DHCP_FAST deadIpStack:-1showDefer:true
7758 DEB Feb 24 11:17:04.799132 (668:825) JAVA-callagent MQThread|cip.callagent.CallAgent:? - resetData:resetState:SOFT_RESET_REQUESTED registrationState:PAUSE dhcpOption:DHCP_FAST deadIpStack:-1showDefer:true, requested:true, pending:false, paused:true
7759 NOT Feb 24 11:17:04.799296 (668:809) JAVA-reset MQThread|cip.cfg.Config: - [sanityCheckForConfigFileInRam] [valid] configFileAvailableInRam is false and configFilenameInRam is null
7760 NOT Feb 24 11:17:04.799545 (668:825) JAVA-callagent MQThread|cip.callagent.CallAgent$2:? - resetData:resetState:SOFT_RESET_PENDING registrationState:NORMAL dhcpOption:DHCP_FAST deadIpStack:-1showDefer:true, requested:false, pending:true, paused:false
7761 NOT Feb 24 11:17:04.799777 (668:852) JAVA-upgradereboot MQThread|cip.urui.UpgradeReboot$1:? - statusChanged() called resetData: resetState:SOFT_RESET_PENDING registrationState:NORMAL dhcpOption:DHCP_FAST deadIpStack:-1showDefer:true
7762 NOT Feb 24 11:17:04.799892 (668:854) JAVA-memoryleakreboot MQThread|cip.urui.MemoryLeakReboot$1:? - statusChanged() called resetData: resetState:SOFT_RESET_PENDING registrationState:NORMAL dhcpOption:DHCP_FAST deadIpStack:-1showDefer:true
7763 NOT Feb 24 11:17:04.800032 (668:856) JAVA-sipcc MQThread|SipCcAdapter: - readyForSoftReset(): mgmtState=MGMT_AWAIT_SHUTDOWN_SOFT_RESET(11), configFetchRequested:false, sipcc-service started?true
7764 NOT Feb 24 11:17:04.800100 (668:856) JAVA-sipcc MQThread|SipCcAdapter: - readyForSoftReset(): no connected call case..