Before compiling. In acc makefile, uncomment: DEFS+=-DSQL_ACC In main Makefile exclude_modules?= cpl cpl-c extcmd \ snmp postgres \ im \ jabber mysql \ /*remove mysql*/ auth_radius group_radius uri_radius Be sure that mysql module is rightly compiled, and mysql.so file is created. In ser.cfg, the basic lines to enable accounting are: loadmodule "/usr/local/lib/ser/modules/mysql.so" loadmodule "/usr/local/lib/ser/modules/acc.so" modparam("acc", "db_url", "sql://ser:heslo@localhost/ser") modparam("acc", "db_flag", 1) //See if you put "log_flag", in this case you are logging in syslog. In route () { setflag(1); //All will be marked with flag one enabled. This flag must be the same that you are watching with "db_flag" parameter. In my case, only this is necessary to obtain an accounting. Best Regards