hello, Jan Janak and other guys:
I try to connect ser and freeradius. i also follow the hints(ser_radius how to) from iptel.com.
but when i run ser, it stopping at mysql parts and not errors. my ser.cfg is :
                                                                                           
# ------------------ module loading ----------------------------------
                                                                                                
# Uncomment this if you want to use SQL database
loadmodule "/usr/local/lib/ser/modules/mysql.so"
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/maxfwd.so"
loadmodule "/usr/local/lib/ser/modules/usrloc.so"
loadmodule "/usr/local/lib/ser/modules/registrar.so"
loadmodule "/usr/local/lib/ser/modules/exec.so"

loadmodule "/usr/local/lib/ser/modules/textops.so"
                                                                                                
# RADIUS support
loadmodule "/usr/local/lib/ser/modules/acc.so"
                                                                                                
# Uncomment this if you want digest authentication
# mysql.so must be loaded !
loadmodule "/usr/local/lib/ser/modules/auth.so"
loadmodule "/usr/local/lib/ser/modules/auth_radius.so"
                                                                                                
# ----------------- setting module-specific parameters ---------------
                                                                                                
# -- usrloc params --
                                                                                                
# Uncomment this if you want to use SQL database
# for persistent storage and comment the previous line
modparam("usrloc", "db_mode", 2)
                                                                                                
# -- rr params --
# add value to ;lr param to make some broken UAs happy
modparam("rr", "enable_full_lr", 1)
                                                                                                
# -- acc params --
modparam("acc", "radius_config", "/etc/radiusclient/radiusclient.conf")
modparam("acc", "radius_missed_flag", 2)
modparam("acc", "radius_config", "/etc/radiusclient/radiusclient.conf")
modparam("acc", "radius_missed_flag", 2)
modparam("acc", "radius_flag", 1)
                                                                                                
# -- auth_radius params --
modparam("auth_radius", "radius_config", "/etc/radiusclient/radiusclient.conf")
                                                                                                
# -------------------------  request routing logic -------------------
                                                                                                
# main routing logic
                                                                                                
   route{
                                                                                                
       # initial sanity checks -- messages with
       # max_forwards==0, or excessively long requests
       if (!mf_process_maxfwd_header("10")) {
           log(1,"LOG: Too many hops");
           sl_send_reply("483","Too Many Hops");
           break;
       };
       if ( msg:len > max_len ) {
           log(1,"LOG: Message too big");
 loose-route processing
       if(loose_route()){
               t_relay();
               break;
       };
                                                                                                
       if(uri==myself){
                                                                                                
  # All REGISTER attempts are processed and must always be authenticated
           if (method=="REGISTER"){
               if (!radius_www_authorize("")) {
                   www_challenge("", "0");
                   break;
               };
                                                                                                
               save("location");
                       break;
           };
                                                                                                
 I post only part of ser.cfg. the errors are :

 0(0) find_mod_export: found <db_query> in module mysql [/usr/local/lib/ser/modules/mysql.so]
 0(0) find_mod_export: found <db_raw_query> in module mysql [/usr/local/lib/ser/modules/mysql.so] 0(0) find_mod_export: found <db_free_result> in module mysql [/usr/local/lib/ser/modules/mysql.so]
 0(0) find_mod_export: found <db_insert> in module mysql [/usr/local/lib/ser/modules/mysql.so]
 0(0) find_mod_export: found <db_delete> in module mysql [/usr/local/lib/ser/modules/mysql.so]
 0(0) find_mod_export: found <db_update> in module mysql [/usr/local/lib/ser/modules/mysql.so]
thanks lot!

zhu