On Thu, Feb 11, 2010 at 8:09 PM, Daniel-Constantin Mierla &lt;miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote: Hello, ok, then the only point in mod_init of siptrace that causes initialization error without printing a log message is when you haven't set the trace_flag parameter: http://kamailio.org/docs/modules/3.0.x/modules_k/siptrace.html#id2520001 Cheers, Daniel Hi Daniel, That fixed it. Perhaps there is a bug in that it's not picking up the default of 0?