[Serusers] nathelper and natping interval

Hello, I have problem with natping_interval.. it is not pinging at all and look like it just doesnot aware that I have something registered I use lates table release: 0.8.12 I added some more debugging in nathelper.c to timer function: DBG("DEBUG: nathelper buff != NULL\n"); cp = buf; while (1) { memcpy(&(c.len), cp, sizeof(c.len)); if (c.len == 0) { LOG(L_ERR, "ERROR: nathelper::c.len == 0\n"); break; } and can see that it break from the loop with c.len = 0. but when i look at location table in mysql there is few devices registered. probably something with ul_get_all_ucontact from usrloc.. please advise here is config: loadmodule "/usr/local/lib/ser/modules/sl.so" loadmodule "/usr/local/lib/ser/modules/tm.so" loadmodule "/usr/local/lib/ser/modules/rr.so" loadmodule "/usr/local/lib/ser/modules/auth.so" loadmodule "/usr/local/lib/ser/modules/auth_db.so" loadmodule "/usr/local/lib/ser/modules/mysql.so" loadmodule "/usr/local/lib/ser/modules/auth_mssql.so" loadmodule "/usr/local/lib/ser/modules/usrloc.so" loadmodule "/usr/local/lib/ser/modules/textops.so" loadmodule "/usr/local/lib/ser/modules/maxfwd.so" loadmodule "/usr/local/lib/ser/modules/registrar.so" loadmodule "/usr/local/lib/ser/modules/nathelper.so" loadmodule "/usr/local/lib/ser/modules/exec.so" modparam("nathelper", "natping_interval", 10) modparam("registrar", "nat_flag", 6) # modparam("nathelper", "ping_nated_only", 1) # Ping only clients behind NAT modparam("auth_db", "db_url","sql://ser:XXX@localhost/ser") modparam ("usrloc", "db_mode", 1) modparam("usrloc", "use_domain", 0) modparam("usrloc", "db_url", "sql://ser:XXX@localhost/ser") modparam("rr", "enable_full_lr", 1) force_rport(); fix_nated_contact(); setflag(6); # Mark as natted all clients if (!(method=="REGISTER")) record_route(); # 1=loose routing # loose-route processing if (loose_route()) { log(1, "LOOSE ROUTE\n"); t_relay(); break; }; if(!uri==myself) { log(1, "URI!=myself"); t_relay(); break; }; if (method=="REGISTER") { log(1, "REGISTER REQUEST RECEIVED\n"); if (!mssql_authorize("209.227.183.21", "subscriber")) { log(1, "AUTH FAILED, REQUESTED\n"); www_challenge("", "1"); break; }; log(1, "AUTH OK, REGISTER\n"); save("location"); break; }; ..... -- Best regards, Vitali