Hello, On a Kamailio deployment  it seems some users get to a wrong state and permanently keeping in: CS_DIRTY  Expires==0 for some long times (even half an hour). When they're in this status seems system cannot reach them. Normally , when working on USRLoc mode 2 if the registration expires usually what I observed is that it just not appears on 'kamctl ul show' The affected users are seen like this: AOR:: blue4 Contact:: sip:Blue4@192.168.101.6:5700 Q= Expires:: deleted Callid:: efc560dc2dbd248d4d1f9d39633773df Cseq:: 49995 User-agent:: PoC-client/OMA1.0 Genaker_X-Platform_IMS_SDK/v2.0 State:: CS_DIRTY Flags:: 0 Cflag:: 0 Socket:: udp:10.133.21.141:6666 Methods:: 8143 The refresh from the clients seem to come intime however some users (and not all) got to this CS_DIRTY state instead of being removed or refreshed. The client refresh looks to arrive in-time so it should be refreshed. Which could be a common cause (misconfiguration?) for this type of problem?  If not, could enable debug mode for usrloc or I need to enable for full kamailio? Thanks Albert