kamailio.cfg

#!KAMAILIO
#
# sample config file for dispatcher module
# - load balancing of VoIP calls with round robin
# - no TPC listening
#

####### Global Parameters #########
##!define WITH_DEBUG
#!ifdef WITH_DEBUG
debug=4
log_stderror=yes
#!else
debug=2
log_stderror=no
#!endif

memdbg=5
memlog=5

fork=yes
children=4

disable_tcp=yes

auto_aliases=no

# ----- docker container with host ip and port advertised.
# listen=udp:0.0.0.0 advertise 192.168.59.30:5060

port=5060

sip_warning=no

####### Modules Section ########

# set paths to location of modules (to sources or installation folders)
#!ifdef WITH_SRCPATH
mpath="modules/"
#!else
mpath="/usr/lib64/kamailio/modules/"
#!endif

loadmodule "mi_fifo.so"
loadmodule "kex.so"
loadmodule "tm.so"
loadmodule "tmx.so"
loadmodule "sl.so"
loadmodule "rr.so"
loadmodule "pv.so"
loadmodule "maxfwd.so"
loadmodule "textops.so"
loadmodule "siputils.so"
loadmodule "xlog.so"
loadmodule "sanity.so"
loadmodule "ctl.so"
loadmodule "mi_rpc.so"
loadmodule "dispatcher.so"

# ----- mi_fifo params -----
modparam("mi_fifo", "fifo_name", "/tmp/kamailio_fifo")

# ----- rr params -----
# add value to ;lr param to cope with most of the UAs
modparam("rr", "enable_full_lr", 1)
# do not append from tag to the RR (no need for this script)
modparam("rr", "append_fromtag", 0)


# ----- tm params -----
modparam("tm", "fr_timer", 2000)
modparam("tm", "fr_inv_timer", 40000)

# ----- dispatcher params -----
modparam("dispatcher", "list_file", "/etc/kamailio/dispatcher.list")
modparam("dispatcher", "flags", 2)
modparam("dispatcher", "dst_avp", "$avp(AVP_DST)")
modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)")
modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)")

modparam("dispatcher", "ds_probing_mode", 1)
modparam("dispatcher", "ds_ping_interval", 15)
modparam("dispatcher", "ds_probing_threshold", 1)
modparam("dispatcher", "ds_ping_reply_codes", "class=2;class=3;class=4")


####### Routing Logic ########


# main request routing logic

route {
  # per request initial checks
  route(REQINIT);

  # handle requests within SIP dialogs
  route(WITHINDLG);

  # CANCEL processing
  if (is_method("CANCEL"))
  {
    if (t_check_trans())
      t_relay();
    exit;
  }

	# handle retransmissions
	if(t_precheck_trans()) {
		t_check_trans();
		exit;
	}
  t_check_trans();

  # record routing for dialog forming requests (in case they are routed)
  # - remove preloaded route headers
  remove_hf("Route");
  if (is_method("INVITE|SUBSCRIBE"))
    record_route();

  # Directly relay without dispatch
  route(PRESENCE);
  route(REGISTRAR);

  # dispatch destinations
  route(DISPATCH);

  if ($rU==$null)
  {
    # request with no Username in RURI
    sl_send_reply("484","Address Incomplete");
    exit;
  }
}

route[RELAY] {
  if (!t_relay()) {
    sl_reply_error();
  }
  exit;
}

# Per SIP request initial checks
route[REQINIT] {
  if (!mf_process_maxfwd_header("10")) {
    sl_send_reply("483","Too Many Hops");
    exit;
  }

  if(!sanity_check("1511", "7"))
  {
    xlog("Malformed SIP message from $si:$sp\n");
    exit;
  }
}

# Handle requests within SIP dialogs
route[WITHINDLG] {
  if (!has_totag()) return;

  # sequential request withing a dialog should
  # take the path determined by record-routing
  if (loose_route()) {
    route(RELAY);
    exit;
  }
  
  if (is_method("SUBSCRIBE") && uri == myself) {
    # in-dialog subscribe requests
    route(PRESENCE);
    exit;  
  }

  if ( is_method("ACK") ) {
    if ( t_check_trans() ) {
      # non loose-route, but stateful ACK;
      # must be ACK after a 487 or e.g. 404 from upstream server
      route(RELAY);
    }
    # ACK without matching transaction ... ignore and discard.
    exit;
  }
  
  sl_send_reply("404","Not here");
  exit;
}

# Handle SIP registrations
route[REGISTRAR] {
  if(!is_method("REGISTER"))
    return;
  if (uri == myself) {
    sl_send_reply("404", "No registrar");
    exit;
  }
  route(RELAY);
}

# Presence server route
route[PRESENCE] {
  if(!is_method("PUBLISH|SUBSCRIBE"))
    return;
  if (uri == myself) {
    sl_send_reply("404", "No here");
    exit;
  }
  route(RELAY);
  exit;
}

# Dispatch requests
route[DISPATCH] {
  # Destination types:
  # http://kamailio.org/docs/modules/4.2.x/modules/dispatcher.html#dispatcher.f.ds_select_dst
  # 4 = round robin
  # 9 = weight-based
  # round robin dispatching on gateways group '1'
  if(!ds_select_dst("1", "9"))
  {
    send_reply("404", "No destination");
    exit;
  }

  t_set_fr(0,2000);
  t_on_failure("ROUTE_ADVANCE");

  route(RELAY);
  exit;
}

event_route[dispatcher:dst-down] {
  xlog("L_ERR", "Destination down: $rm $ru ($du)\n");
}

event_route[dispatcher:dst-up] {
  xlog("L_ERR", "Destination up: $rm $ru\n");
}

failure_route[ROUTE_ADVANCE] {
  if (t_is_canceled()) {
    exit;
  }

  xlog("L_NOTICE", "Media server $du failed to answer, selecting other one!\n");

  if (t_check_status("503") || (t_branch_timeout() and !t_branch_replied())) {
    ds_mark_dst("ip");
    # select the new destination
    if(ds_next_dst()) {
      # again set local timeout for reply
      # xlog("L_NOTICE", "Selecting next route upon failure\n");
      t_set_fr(0,2000);
      t_on_failure("ROUTE_ADVANCE");
      route(RELAY);
      exit;
    } else {
      #last available node failed to reply, no other destinations available
      send_reply("404", "No destination");
      xlog("L_NOTICE","No destination, sent 404\n");
      exit;
    }
  } else {
    xlog("L_NOTICE","Unhandled failured route!\n");
  }
}