Hi all,

I am trying to implement simple call forwarding in my script. The problem is when the call is forwarded to a another registered user and if the user is not in the location table, the message is correctly returned as "User Not Found".

But if the user is present in the location table, the call does not get forwarded and invite comes to the same number again. This happens when the call is forwarded on no answer. I try to do serial forking using avp_pushto() but it does'nt seem to work.

Can someone please help me out. The blind forwarding works perfectly.

Here is my script:

debug=3
fork=yes
log_stderror=no

listen=202.XX.61.XX  # INSERT YOUR IP ADDRESS HERE
port=5060
children=4

dns=no
rev_dns=no
fifo="/tmp/openser_fifo"
fifo_db_url="mysql://openser:openserrw@localhost/openser"

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/auth.so"
loadmodule "/usr/local/lib/openser/modules/auth_db.so"
loadmodule "/usr/local/lib/openser/modules/uri.so"
loadmodule "/usr/local/lib/openser/modules/uri_db.so"
loadmodule "/usr/local/lib/openser/modules/mediaproxy.so"
loadmodule "/usr/local/lib/openser/modules/nathelper.so"
loadmodule "/usr/local/lib/openser/modules/textops.so"
loadmodule "/usr/local/lib/openser/modules/avpops.so"
loadmodule "/usr/local/lib/openser/modules/domain.so"
loadmodule "/usr/local/lib/openser/modules/permissions.so"

modparam("auth_db|permissions|uri_db|usrloc",
 "db_url", "mysql://openser:openserrw@localhost/openser")
modparam("auth_db", "calculate_ha1", 1)
modparam("auth_db", "password_column", "password")

modparam("nathelper", "rtpproxy_disable", 1)
modparam("nathelper", "natping_interval", 0)

modparam("mediaproxy","natping_interval", 30)
modparam("mediaproxy","mediaproxy_socket", "/var/run/mediaproxy.sock")
modparam("mediaproxy","sip_asymmetrics","/usr/local/etc/ser/sip-clients")
modparam("mediaproxy","rtp_asymmetrics","/usr/local/etc/ser/rtp-clients")

modparam("usrloc", "db_mode", 2)
modparam("usrloc", "use_domain", 1)

modparam("registrar", "nat_flag", 6)
modparam("registrar", "use_domain", 1)

modparam("rr", "enable_full_lr", 1)

modparam("tm", "fr_inv_timer", 27)
modparam("tm", "fr_inv_timer_avp", "inv_timeout")

modparam("permissions", "db_mode", 1)
modparam("permissions", "trusted_table", "trusted")

modparam("avpops", "avp_url", "mysql://openser:openserrw@localhost/openser")
modparam("avpops", "avp_table", "usr_preferences")

route {

 # -----------------------------------------------------------------
 # Sanity Check Section
 # -----------------------------------------------------------------
 if (!mf_process_maxfwd_header("10")) {
  sl_send_reply("483", "Too Many Hops");
  return;
 };

 if (msg:len > max_len) {
  sl_send_reply("513", "Message Overflow");
  return;
 };

 # -----------------------------------------------------------------
 # Record Route Section
 # -----------------------------------------------------------------
 if (method=="INVITE" && client_nat_test("3")) {
  # INSERT YOUR IP ADDRESS HERE
  record_route_preset("202.XX.61.XX:5060;nat=yes");
 } else if (method!="REGISTER") { 
  record_route(); 
 };

 # -----------------------------------------------------------------
 # Call Tear Down Section
 # -----------------------------------------------------------------
 if (method=="BYE" || method=="CANCEL") {
  end_media_session();
 };

 # -----------------------------------------------------------------
 # Loose Route Section
 # -----------------------------------------------------------------
 if (loose_route()) {

  if (has_totag() && (method=="INVITE" || method=="ACK")) {

   if (client_nat_test("3")||search("^Route:.*;nat=yes")){
    setflag(6);
    use_media_proxy();
   };
  };

  route(1);
  return;
 };

 # -----------------------------------------------------------------
 # Call Type Processing Section
 # -----------------------------------------------------------------
 if (!is_uri_host_local()) {
  if (is_from_local() || allow_trusted()) {
   route(4);
   route(1);
  } else {
   sl_send_reply("403", "Forbidden");
  };
  return;
 };

 if (method=="CANCEL") {
  route(1);
  return;
 } else if (method=="INVITE") {
  route(3);
  return;
 } else  if (method=="REGISTER") {
  route(2);
  return;
 };

 lookup("aliases");
 if (uri!=myself) {
  route(4);
  route(1);
  return;
 };

 if (!lookup("location")) {
  sl_send_reply("404", "User Not Found");
  return;
 };

 route(1);
}

route[1] {

 # -----------------------------------------------------------------
 # Default Message Handler
 # -----------------------------------------------------------------

 t_on_reply("1");

 if (!t_relay()) {

  if (method=="INVITE" || method=="ACK") {
   end_media_session();
  };

  sl_reply_error();
 };
}

route[2] {

 # -----------------------------------------------------------------
 # REGISTER Message Handler
 # -----------------------------------------------------------------

 sl_send_reply("100", "Trying");

 if (!search("^Contact:[ ]*\*") && client_nat_test("7")) {
  setflag(6);
  fix_nated_register();
  force_rport();
 };

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

 if (!check_to()) {
  sl_send_reply("401", "Unauthorized");
  return;
 };

 consume_credentials();

 if (!save("location")) {
  sl_reply_error();
 };
}

route[3] {

 # -----------------------------------------------------------------
 # INVITE Message Handler
 # -----------------------------------------------------------------

 if (!allow_trusted()) {

  if (!proxy_authorize("","subscriber")) {
   proxy_challenge("","0");
   return;
  } else if (!check_from()) {
   sl_send_reply("403", "Use From=ID");
   return;
  };

  consume_credentials();
 };

 if (client_nat_test("3")) {
  setflag(7);
  force_rport();
  fix_nated_contact();
 };

 if (uri=~"^sip:1[0-9]{10}@") {
  strip(1);
 };

 lookup("aliases");
 if (uri!=myself) {
  route(4);
  route(1);
  return;
 };

 if (uri=~"^sip:011[0-9]*@") {
  route(4);
  route(5);
  return;
 };

 if (avp_db_load("$ruri/username", "$avp(s:callfwd)")) {
  setflag(22);
  avp_pushto("$ruri", "$avp(s:callfwd)");
  route(6);
  return;
 };

 if (!lookup("location")) {

  /*if (uri=~"^sip:[0-9]{10}@") {
   route(4);
   route(5);
   return;
  };*/

  sl_send_reply("404", "User Not Found");
  return;
 };

 if (avp_db_load("$ruri/username", "$avp(s:fwdbusy)")) {
  if (!avp_check("$avp(s:fwdbusy)", "eq/$ruri/i")) {
   setflag(26);
  };
 };

 if (avp_db_load("$ruri/username", "$avp(s:fwdnoanswer)")) {
  if (!avp_check("$avp(s:fwdnoanswer)", "eq/$ruri/i")) {
   setflag(27);
  };
 };

 t_on_failure("1");

 route(4);
 route(1);
}

route[4] {

 # -----------------------------------------------------------------
 # NAT Traversal Section
 # -----------------------------------------------------------------

 if (isflagset(6) || isflagset(7)) {
  if (!isflagset(8)) {
   setflag(8);
   use_media_proxy();
  };
 };
}

route[5] {

 # -----------------------------------------------------------------
 # PSTN Handler
 # -----------------------------------------------------------------

 rewritehost("216.168.162.97"); # INSERT YOUR PSTN GATEWAY IP ADDRESS

 avp_write("i:45", "$avp(s:inv_timeout)");

 t_on_failure("1");

 route(4);
 route(1);
}

route[6] {

 # ------------------------------------------------------------------------
 # Call Forwarding Reply Route Handler
 #
 # This must be done as a route block because sl_send_reply() cannot be
 # called from the failure_route block
 # ------------------------------------------------------------------------

 if (uri=~"^sip:1[0-9]{10}@") {
  strip(1);
 };

 lookup("aliases");

 if (!isflagset(22)) {
  append_branch();
 };
   
 if (uri!=myself) {

  route(4);
  route(1);
  return;
 };

 if (uri=~"^sip:011[0-9]*@") {
  route(4);
  route(5);
  return;
 };

 if (!lookup("location")) {

  /*if (uri=~"^sip:[0-9]{10}@") {
   route(4);
   route(1);
   return;
  };*/

  sl_send_reply("404", "User Not Found");
  return;
 };

 route(4);
 route(1);
}

onreply_route[1] {

 if ((isflagset(6) || isflagset(7)) &&
     (status=~"(180)|(183)|2[0-9][0-9]")) {

  if (!search("^Content-Length:[ ]*0")) {
   use_media_proxy();
  };
 };

 if (client_nat_test("1")) {
  fix_nated_contact();
 };
}

failure_route[1] {

 if (t_check_status("487")) {
  return;
 };

 if (isflagset(26) && t_check_status("486")) {
  if (avp_pushto("$ruri", "$avp(s:fwdbusy)")) {
   avp_delete("$avp(s:fwdbusy)");
   resetflag(26);
   route(6);
   return;
  };
 };

 if (isflagset(27) && t_check_status("408")) {
  if (avp_pushto("$ruri", "$avp(s:fwdnoanswer)")) {
   avp_delete("$avp(s:fwdnoanswer)");
   resetflag(27);
   route(6);
   return;
  };
 };

 end_media_session();
}