This is my openser.cfg;
I'm using it to replicate the SIP registration from one asterisk to another one (to have always the same registration status of SIP in all 2 asterisk,in case of falls, every 2 ,have the same configuration and softphones run without registration problem...(this is my purpose....) .
 

# demo script showing how to set-up usrloc replication
# SCRIPT PER COPIARE LO STATO DELLE REGISTRAZIONI DEI SIP DAL .12 all' .11

# ----------- global configuration parameters ------------------------

debug=3          # debug level (cmd line: -dddddddddd)
fork=no  
log_stderror=yes # (cmd line: -E)
#listen= 192.16.25.11
port=5060  
# ------------------ module loading ----------------------------------

loadmodule "/usr/local/lib/openser/modules/mysql.so"
loadmodule "/usr/local/lib/openser/modules/sl.so"
loadmodule "/usr/local/lib/openser/modules/tm.so"
#loadmodule "/usr/local/lib/openser/modules/rr.so"
loadmodule "/usr/local/lib/openser/modules/maxfwd.so"
loadmodule "/usr/local/lib/openser/modules/usrloc.so"
loadmodule "/usr/local/lib/openser/modules/registrar.so"
#loadmodule "/usr/local/lib/openser/modules/textops.so" 
loadmodule "/usr/local/lib/openser/modules/auth.so"
loadmodule "/usr/local/lib/openser/modules/auth_db.so"  

# ----------------- setting module-specific parameters ---------------

# digest generation secret; use the same in backup server;
# also, make sure that the backup server has sync'ed time
modparam("auth", "secret", "alsdkhglaksdhfkloiwr")

# -------------------------  request routing logic -------------------

# main routing logic

route{

 # initial sanity checks -- messages with
 # max_forwars==0, or excessively long requests
 if (!mf_process_maxfwd_header("10")) {
  sl_send_reply("483","Too Many Hops");
  return;
 };
 #if (len_gt( max_len )) {
 if ( msg:len > max_len ){ 
  sl_send_reply("513", "Message too big");
  return;
 };

 # if the request is for other domain use UsrLoc
 # (in case, it does not work, use the following command
 # with proper names and addresses in it)
 if (uri==myself) {

  if (method=="REGISTER") {

   # verify credentials
   if (!www_authorize("", "subscriber")) {
    www_challenge("", "0");
    return;
   };

   # if ok, update contacts and ...
   save("location");
   # ... if this REGISTER is not a replica from our
   # peer server, replicate to the peer server
   if (!src_ip== 192.16.25.12) {
    t_replicate("192.16.25.12","5060"); 
   };
   return;
  };
  # do whatever else appropriate for your domain
  log("non-REGISTER\n");
 };
}

When I run openser happens this:
 
[root@asterisk11 ~]# openser
 0(3294) WARNING: fix_socket_list: could not rev. resolve 192.16.25.11
 0(3294) WARNING: fix_socket_list: could not rev. resolve 192.16.25.11
Listening on
             udp: 127.0.0.1 [127.0.0.1]:5060
             udp: 192.16.25.11 [ 192.16.25.11]:5060
             tcp: 127.0.0.1 [127.0.0.1]:5060
             tcp: 192.16.25.11 [ 192.16.25.11]:5060
Aliases:
             tcp: asterisk11.local:5060
             udp: asterisk11.local :5060
WARNING: no fork mode  and more than one listen address found(will use only the the first one)
stateless - initializing
 0(0) Maxfwd module- initializing
 0(0) AUTH module - initializing
 0(0) AUTH_DB module - initializing
 0(0) INFO: udp_init: SO_RCVBUF is initially 110592
 0(0) INFO: udp_init: SO_RCVBUF is finally 221184
 0(0) WARNING: using only the first listen address (no fork)
 
 
 
and then the windows doesn't respond.....is all stop....where is the problem?
10000000 thanks!