[Serusers] Can't log the Invite

Dear all My ser+freeradius system does not log the INVITE message , I tried to listen the port 1813 that is radius accounting port, but there is no packet come here , when i call to someone. When i terminated the call , the BYE packet will come. Please help me to solve this promble See below for the ser.cfg . . . modparam("acc","log_level",1) modparam("acc","log_flag",1) modparam("acc","log_missed_flag",2) modparam("acc","failed_transactions",1) modparam("acc","report_ack",0) modparam("acc","report_cancels",1) modparam("acc", "radius_config", "/usr/local/etc/radiusclient/radiusclient.conf") modparam("acc","radius_flag",1) modparam("acc","radius_missed_flag",2) . . . if (method=="INVITE" || method=="BYE" || method=="CANCEL") setflag(1); . . . AR.