Ok Joli! Here is the way I do this. At the begining of your kamailio.cfg, just after "#!KAMAILIO" insert this define: #!define WITH_DEBUG In your global parameters, you must now define what happens if "WITH_DEBUG" is configurated, so add these lines: #!ifdef WITH_DEBUG debug=4 log_stderror=yes #!else debug=2 log_stderror=no #!endif On Modules Selection, load the module debbuger.so: #!ifdef WITH_DEBUG loadmodule "debugger.so" #!endif And set the module specific parameters: #!ifdef WITH_DEBUG # ----- debugger params ----- modparam("debugger", "cfgtrace", 1) #!endif Maybe some of these informations can be there, but I am not sure about the default configuration file. After these changes, restart your kamailio and you should see a lot of information in your screen. Then, just try to find the error there. I just asked something here in this forum as well, and posted my .cfg file there. If you want to check the places where I put these lines, take a look at the topic "MULTIDOMAIN Environment". After discover the error and finish your troubleshooting, you can just comment the line #!define WITH_DEBUG putting one more # at the beginning of it and you will not see the debug information anymore. *Bruno Emer*