[SR-Users] Logging peer status

Hi, I'm coming from an asterisk background and are now using kamailio to handle registration and load balancing. In the asterisk world I added qualify=yes and listening on the AMI for events when peer is registering / unregistering / peer goes unreachable and reachable - then storing this info in a MySQL db to be displayed on a web page for support etc. This works really nicely and I'm trying to figure out how to do the same with kamailio and are able to generate an event when a peer is registering (in the registry route using mqueue and some lua magic). But can't find a way to get an event when an option ping (nathelper module) is unsuccessful or when an location record has expired(http://lists.kamailio.org/pipermail/users/2009-May/023270.html). So my question is - how are you guys dealing with this? What have I missed? /niklas