Hi, I found that Kamailio 4.0.x crashes when used with the 'reginfo_handle_notify' function of the PUA_REGINFO module. Regarding this, I opened a bugtracker task to provide details and to suggest a possible solution. (FS#338) Although I could got it work with a couple of fixes, it seems that the module needs to be updated to reflect changes in its dependent modules. (FYI please refer to FS#339) I have been working with Kamilio for almost 2 years and would love to see this great product advance continually. I appreciate your kind assistence and hard works. Best regards, Wonbin