WebRTC SBC балансировщик Kamailio

Опубликовано в Kamailio

Kamailio and FreeSwitch

SBC – пограничный контролер сеансов, Kamailio (OpenSER) высокоэффективный SIP прокси сервер и FreeSwitch мультимедийный и многопротокольный медиа SIP SoftSwitch. В паре они создают великолепный тандем, взаимодействия с сетью VoIP.

Одной из выдающихся особенностей Kamailio является способность обслуживать большое количество активных пользователей в одном сервере (в зависимости от аппаратного обеспечения их может быть до 100 000+). Длительный срок развития Kamailio обеспечивает стабильность, необходимую в режиме реального времени телекоммуникаций и широкий набором функций в работе с SIP сигнализацией.

FreeSWITCH это программный коммутатор с открытым исходным кодом, поддерживающий SIP. Его возможности обработки медиа трафика делают FreeSWITCH идеальным решением для предоставления услуг мультимедиа в платформах провайдера VoIP на базе Kamailio.

Разделяя полномочия между серверами:
Kamailio выполняет:

- аутентификацию пользователей
- регистрацию пользователей
- сохранение местоположения пользователей
- маршрутизация вызовов<
- балансировка нагрузки между медиа серверами
- обработка вебсокетов WebRTC
- сокрытие топологии и проксирование медиа потоков

FreeSWITCH предоставляет:

- транскодинг голосовых кодеков, в том числе и HD
- сервис голосовой почты
- прием факсимильных сообщений (факс сервер)
- конференции
- другие медиа-сервисы (привествия, IVR, и тд.)

 
#!KAMAILIO
 
# Kamailio (OpenSER) SIP Server v4.2 - default configuration script
#
# for an explanation of possible statements, functions and parameters.
#
# Several features can be enabled using '#!define WITH_FEATURE' directives:
#
# *** To run in debug mode: 
#     - define WITH_DEBUG
#
# *** To enable mysql: 
#     - define WITH_MYSQL
#
# *** To enable authentication execute:
#     - enable mysql
#     - define WITH_AUTH
#     - add users using 'kamctl'
#
# *** To enable IP authentication execute:
#     - enable mysql
#     - enable authentication
#     - define WITH_IPAUTH
#     - add IP addresses with group id '1' to 'address' table
#
# *** To enable persistent user location execute:
#     - enable mysql
#     - define WITH_USRLOCDB
#
# *** To enable presence server execute:
#     - enable mysql
#     - define WITH_PRESENCE
#
# *** To enable nat traversal execute:
#     - define WITH_NAT
#     - install RTPProxy: http://www.rtpproxy.org
#     - start RTPProxy:
#        rtpproxy -l _your_public_ip_ -s udp:localhost:7722
#
# *** To enable PSTN gateway routing execute:
#     - define WITH_PSTN
#     - set the value of pstn.gw_ip
#     - check route[PSTN] for regexp routing condition
#
# *** To enable database aliases lookup execute:
#     - enable mysql
#     - define WITH_ALIASDB
#
# *** To enable speed dial lookup execute:
#     - enable mysql
#     - define WITH_SPEEDDIAL
#
# *** To enable multi-domain support execute:
#     - enable mysql
#     - define WITH_MULTIDOMAIN
#
# *** To enable TLS support execute:
#     - adjust CFGDIR/tls.cfg as needed
#     - define WITH_TLS
#
# *** To enable XMLRPC support execute:
#     - define WITH_XMLRPC
#     - adjust route[XMLRPC] for access policy
#
# *** To enable anti-flood detection execute:
#     - adjust pike and htable=>ipban settings as needed (default is
#       block if more than 16 requests in 2 seconds and ban for 300 seconds)
#     - define WITH_ANTIFLOOD
#
# *** To block 3XX redirect replies execute:
#     - define WITH_BLOCK3XX
#
# *** To enable VoiceMail routing execute:
#     - define WITH_VOICEMAIL
#     - set the value of voicemail.srv_ip
#     - adjust the value of voicemail.srv_port
#
# *** To enhance accounting execute:
#     - enable mysql
#     - define WITH_ACCDB
#     - add following columns to database
 
#!ifdef ACCDB_COMMENT
  ALTER TABLE acc ADD COLUMN src_user VARCHAR(64) NOT NULL DEFAULT '';
  ALTER TABLE acc ADD COLUMN src_domain VARCHAR(128) NOT NULL DEFAULT '';
  ALTER TABLE acc ADD COLUMN src_ip varchar(64) NOT NULL default '';
  ALTER TABLE acc ADD COLUMN dst_ouser VARCHAR(64) NOT NULL DEFAULT '';
  ALTER TABLE acc ADD COLUMN dst_user VARCHAR(64) NOT NULL DEFAULT '';
  ALTER TABLE acc ADD COLUMN dst_domain VARCHAR(128) NOT NULL DEFAULT '';
  ALTER TABLE missed_calls ADD COLUMN src_user VARCHAR(64) NOT NULL DEFAULT '';
  ALTER TABLE missed_calls ADD COLUMN src_domain VARCHAR(128) NOT NULL DEFAULT '';
  ALTER TABLE missed_calls ADD COLUMN src_ip varchar(64) NOT NULL default '';
  ALTER TABLE missed_calls ADD COLUMN dst_ouser VARCHAR(64) NOT NULL DEFAULT '';
  ALTER TABLE missed_calls ADD COLUMN dst_user VARCHAR(64) NOT NULL DEFAULT '';
  ALTER TABLE missed_calls ADD COLUMN dst_domain VARCHAR(128) NOT NULL DEFAULT '';
#!endif
 
####### Include Local Config If Exists #########
import_file "kamailio-local.cfg"
 
####### Defined Values #########
 
# FS-KM integration
# this is original kamailio.cfg file for KM-FS integration from this link:  http://kb.asipto.com/freeswitch:kamailio-3.3.x-freeswitch-1.2.x-sbc
 
#!define WITH_MYSQL
#!define WITH_AUTH
#!define WITH_USRLOCDB
#!define WITH_FREESWITCH
#!define WITH_DEBUG
 
 
 
#!substdef "!MY_IP_ADDR!192.168.1.103!g"
#!substdef "!MY_DOMAIN!192.168.1.103!g"
#!substdef "!MY_WS_PORT!5066!g"
#!substdef "!MY_WSS_PORT!443!g"
#!substdef "!MY_MSRP_PORT!9000!g"
#!substdef "!MY_WS_ADDR!tcp:MY_IP_ADDR:MY_WS_PORT!g"
#!substdef "!MY_WSS_ADDR!tls:MY_IP_ADDR:MY_WSS_PORT!g"
#!substdef "!MY_MSRP_ADDR!tls:MY_IP_ADDR:MY_MSRP_PORT!g"
#!substdef "!MSRP_MIN_EXPIRES!1800!g"
#!substdef "!MSRP_MAX_EXPIRES!3600!g"
 
##!define LOCAL_TEST_RUN
##!define WITH_TLS
#!define WITH_WEBSOCKETS
##!define WITH_MSRP
 
# *** Value defines - IDs used later in config
#!ifdef WITH_MYSQL
# - database URL - used to connect to database server by modules such
#       as: auth_db, acc, usrloc, a.s.o.
#!ifndef DBURL
#!define DBURL "mysql://kamailio:kamailiorw@localhost/kamailio"
#!endif
#!endif
#!ifdef WITH_MULTIDOMAIN
# - the value for 'use_domain' parameters
#!define MULTIDOMAIN 1
#!else
#!define MULTIDOMAIN 0
#!endif
 
# - flags
#   FLT_ - per transaction (message) flags
#  FLB_ - per branch flags
#!define FLT_ACC 1
#!define FLT_ACCMISSED 2
#!define FLT_ACCFAILED 3
#!define FLT_NATS 5
 
#!define FLB_NATB 6
#!define FLB_NATSIPPING 7
 
####### Global Parameters #########
 
### LOG Levels: 3=DBG, 2=INFO, 1=NOTICE, 0=WARN, -1=ERR
#!ifdef WITH_DEBUG
debug=4
log_stderror=no
#!else
debug=2
log_stderror=no
#!endif
 
memdbg=5
memlog=5
 
log_facility=LOG_LOCAL0
 
fork=yes
children=4
 
/* uncomment the next line to disable TCP (default on) */
#disable_tcp=yes
 
/* uncomment the next line to disable the auto discovery of local aliases
   based on reverse DNS on IPs (default on) */
#auto_aliases=no
 
/* add local domain aliases */
#alias="sip.mydomain.com"
#CUSTIMIZE - 403 is returned without this parameter
alias="vortex01.no-ip.info"
alias="sivancev.no-ip.info"
 
/* uncomment and configure the following line if you want Kamailio to 
   bind on a specific interface/port/proto (default bind on all available) */
#listen=udp:10.0.0.10:5060
 
/* port to listen to
 * - can be specified more than once if needed to listen on many ports */
port=5060
 
#!ifdef WITH_TLS
enable_tls=yes
#!endif
 
listen=MY_IP_ADDR
#!ifdef WITH_WEBSOCKETS
listen=MY_WS_ADDR
#!ifdef WITH_TLS
listen=MY_WSS_ADDR
#!endif
#!endif
#!ifdef WITH_MSRP
listen=MY_MSRP_ADDR
#!endif
 
tcp_connection_lifetime=3604
tcp_accept_no_cl=yes
tcp_rd_buf_size=16384
 
#syn_branch=0
 
# life time of TCP connection when there is no traffic
# - a bit higher than registration expires to cope with UA behind NAT
# tcp_connection_lifetime=3605
 
####### Custom Parameters #########
 
# These parameters can be modified runtime via RPC interface
# - see the documentation of 'cfg_rpc' module.
#
# Format: group.id = value 'desc' description
# Access: $sel(cfg_get.group.id) or @cfg_get.group.id
#
 
#!ifdef WITH_PSTN
# PSTN GW Routing
#
# - pstn.gw_ip: valid IP or hostname as string value, example:
# pstn.gw_ip = "10.0.0.101" desc "My PSTN GW Address"
#
# - by default is empty to avoid misrouting
pstn.gw_ip = "" desc "PSTN GW Address"
pstn.gw_port = "" desc "PSTN GW Port"
#!endif
 
#!ifdef WITH_VOICEMAIL
# VoiceMail Routing on offline, busy or no answer
#
# - by default Voicemail server IP is empty to avoid misrouting
voicemail.srv_ip = "" desc "VoiceMail IP Address"
voicemail.srv_port = "5060" desc "VoiceMail Port"
#!endif
 
#!ifdef WITH_FREESWITCH
freeswitch.bindip = "192.168.1.103" desc "<a href="http://voiplab.by/wiki/freeswitch/26-freeswitch-setting-possibilities" >FreeSWITCH</a> IP Address"
freeswitch.bindport = "5090" desc "<a href="http://voiplab.by/wiki/freeswitch/26-freeswitch-setting-possibilities" >FreeSWITCH</a> Port"
#!endif
####### Modules Section ########
 
# set paths to location of modules (to sources or installation folders)
#!ifdef WITH_SRCPATH
mpath="modules/"
#!else
#mpath="/usr/local/lib64/kamailio/modules/"
mpath="/usr/local/kamailio/lib64/kamailio/modules/"
#!endif
 
#!ifdef WITH_MYSQL
loadmodule "db_mysql.so"
#!endif
 
loadmodule "mi_fifo.so"
loadmodule "kex.so"
loadmodule "corex.so"
loadmodule "tm.so"
loadmodule "tmx.so"
loadmodule "sl.so"
loadmodule "rr.so"
loadmodule "pv.so"
loadmodule "maxfwd.so"
loadmodule "usrloc.so"
loadmodule "registrar.so"
loadmodule "textops.so"
loadmodule "siputils.so"
loadmodule "xlog.so"
loadmodule "sanity.so"
loadmodule "ctl.so"
loadmodule "cfg_rpc.so"
loadmodule "mi_rpc.so"
loadmodule "acc.so"
 
#!ifdef WITH_AUTH
loadmodule "auth.so"
loadmodule "auth_db.so"
#!ifdef WITH_IPAUTH
loadmodule "permissions.so"
#!endif
#!endif
 
#!ifdef WITH_ALIASDB
loadmodule "alias_db.so"
#!endif
 
#!ifdef WITH_SPEEDDIAL
loadmodule "speeddial.so"
#!endif
 
#!ifdef WITH_MULTIDOMAIN
loadmodule "domain.so"
#!endif
 
#!ifdef WITH_PRESENCE
loadmodule "presence.so"
loadmodule "presence_xml.so"
#!endif
 
#!ifdef WITH_NAT
loadmodule "nathelper.so"
loadmodule "rtpproxy.so"
#!endif
 
#!ifdef WITH_TLS
loadmodule "tls.so"
#!endif
 
#!ifdef WITH_MSRP
loadmodule "msrp.so"
loadmodule "htable.so"
loadmodule "cfgutils.so"
#!endif
 
#!ifdef WITH_WEBSOCKETS
loadmodule "xhttp.so"
loadmodule "websocket.so"
loadmodule "nathelper.so"
#!endif
 
#!ifdef WITH_ANTIFLOOD
loadmodule "htable.so"
loadmodule "pike.so"
#!endif
 
#!ifdef WITH_XMLRPC
loadmodule "xmlrpc.so"
#!endif
 
#!ifdef WITH_DEBUG
loadmodule "debugger.so"
#!endif
 
# ----------------- setting module-specific parameters ---------------
 
 
# ----- mi_fifo params -----
modparam("mi_fifo", "fifo_name", "/tmp/kamailio_fifo")
 
 
# ----- tm params -----
# auto-discard branches from previous serial forking leg
modparam("tm", "failure_reply_mode", 3)
# default retransmission timeout: 30sec
modparam("tm", "fr_timer", 30000)
# default invite retransmission timeout after 1xx: 120sec
modparam("tm", "fr_inv_timer", 120000)
 
 
# ----- 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)
 
 
# ----- registrar params -----
modparam("registrar", "method_filtering", 1)
/* uncomment the next line to disable parallel forking via location */
# modparam("registrar", "append_branches", 0)
/* uncomment the next line not to allow more than 10 contacts per AOR */
#modparam("registrar", "max_contacts", 10)
# max value for expires of registrations
modparam("registrar", "max_expires", 3600)
# set it to 1 to enable GRUU
modparam("registrar", "gruu_enabled", 0)
 
 
# ----- acc params -----
/* what special events should be accounted ? */
modparam("acc", "early_media", 0)
modparam("acc", "report_ack", 0)
modparam("acc", "report_cancels", 0)
/* by default ww do not adjust the direct of the sequential requests.
   if you enable this parameter, be sure the enable "append_fromtag"
   in "rr" module */
modparam("acc", "detect_direction", 0)
/* account triggers (flags) */
modparam("acc", "log_flag", FLT_ACC)
modparam("acc", "log_missed_flag", FLT_ACCMISSED)
modparam("acc", "log_extra", 
  "src_user=$fU;src_domain=$fd;src_ip=$si;"
  "dst_ouser=$tU;dst_user=$rU;dst_domain=$rd")
modparam("acc", "failed_transaction_flag", FLT_ACCFAILED)
/* enhanced DB accounting */
#!ifdef WITH_ACCDB
modparam("acc", "db_flag", FLT_ACC)
modparam("acc", "db_missed_flag", FLT_ACCMISSED)
modparam("acc", "db_url", DBURL)
modparam("acc", "db_extra",
  "src_user=$fU;src_domain=$fd;src_ip=$si;"
  "dst_ouser=$tU;dst_user=$rU;dst_domain=$rd")
#!endif
 
 
# ----- usrloc params -----
/* enable DB persistency for location entries */
#!ifdef WITH_USRLOCDB
modparam("usrloc", "db_url", DBURL)
modparam("usrloc", "db_mode", 2)
modparam("usrloc", "use_domain", MULTIDOMAIN)
#!endif
 
 
# ----- auth_db params -----
#!ifdef WITH_AUTH
modparam("auth_db", "db_url", DBURL)
modparam("auth_db", "calculate_ha1", yes)
modparam("auth_db", "password_column", "password")
modparam("auth_db", "load_credentials", "")
modparam("auth_db", "use_domain", MULTIDOMAIN)
 
# ----- permissions params -----
#!ifdef WITH_IPAUTH
modparam("permissions", "db_url", DBURL)
modparam("permissions", "db_mode", 1)
#!endif
 
#!endif
 
 
# ----- alias_db params -----
#!ifdef WITH_ALIASDB
modparam("alias_db", "db_url", DBURL)
modparam("alias_db", "use_domain", MULTIDOMAIN)
#!endif
 
 
# ----- speeddial params -----
#!ifdef WITH_SPEEDDIAL
modparam("speeddial", "db_url", DBURL)
modparam("speeddial", "use_domain", MULTIDOMAIN)
#!endif
 
 
# ----- domain params -----
#!ifdef WITH_MULTIDOMAIN
modparam("domain", "db_url", DBURL)
# register callback to match myself condition with domains list
modparam("domain", "register_myself", 1)
#!endif
 
 
#!ifdef WITH_PRESENCE
# ----- presence params -----
modparam("presence", "db_url", DBURL)
 
# ----- presence_xml params -----
modparam("presence_xml", "db_url", DBURL)
modparam("presence_xml", "force_active", 1)
#!endif
 
 
#!ifdef WITH_NAT
# ----- rtpproxy params -----
modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:7722")
 
# ----- nathelper params -----
modparam("nathelper", "natping_interval", 30)
modparam("nathelper", "ping_nated_only", 1)
modparam("nathelper", "sipping_bflag", FLB_NATSIPPING)
modparam("nathelper", "sipping_from", "sip:pinger@kamailio.org")
 
# params needed for NAT traversal in other modules
modparam("nathelper|registrar", "received_avp", "$avp(RECEIVED)")
modparam("usrloc", "nat_bflag", FLB_NATB)
#!endif
 
 
#!ifdef WITH_TLS
# ----- tls params -----
modparam("tls", "config", "/usr/local/etc/kamailio/tls.cfg")
#!endif
 
#!ifdef WITH_WEBSOCKETS
# ----- nathelper params -----
modparam("nathelper|registrar", "received_avp", "$avp(RECEIVED)")
# Note: leaving NAT pings turned off here as nathelper is _only_ being used for
#       WebSocket connections.  NAT pings are not needed as WebSockets have
#       their own keep-alives.
#!endif
 
#!ifdef WITH_MSRP
# ----- htable params -----
modparam("htable", "htable", "msrp=>size=8;autoexpire=MSRP_MAX_EXPIRES;")
#!endif
 
#!ifdef WITH_ANTIFLOOD
# ----- pike params -----
modparam("pike", "sampling_time_unit", 2)
modparam("pike", "reqs_density_per_unit", 16)
modparam("pike", "remove_latency", 4)
 
# ----- htable params -----
# ip ban htable with autoexpire after 5 minutes
modparam("htable", "htable", "ipban=>size=8;autoexpire=300;")
#!endif
 
#!ifdef WITH_XMLRPC
# ----- xmlrpc params -----
modparam("xmlrpc", "route", "XMLRPC");
modparam("xmlrpc", "url_match", "^/RPC")
#!endif
 
#!ifdef WITH_DEBUG
# ----- debugger params -----
modparam("debugger", "cfgtrace", 1)
#!endif
 
####### Routing Logic ########
 
 
# Main SIP request routing logic
# - processing of any incoming SIP request starts with this route
# - note: this is the same as route { ... }
request_route {
 
  # per request initial checks
  route(REQINIT);
 
#!ifdef WITH_WEBSOCKETS
  if (nat_uac_test(64)) {
    # Do NAT traversal stuff for requests from a WebSocket
    # connection - even if it is not behind a NAT!
    # This won't be needed in the future if Kamailio and the
    # WebSocket client support Outbound and Path.
    force_rport();
    if (is_method("REGISTER")) {
      fix_nated_register();
    } else {
      if (!add_contact_alias()) {
        xlog("L_ERR", "Error aliasing contact <$ct>\n");
        sl_send_reply("400", "Bad Request");
        exit;
      }
    }
  }
#!endif
 
  # NAT detection
  route(NATDETECT);
 
  # CANCEL processing
  if (is_method("CANCEL"))
  {
    if (t_check_trans()) {
      route(RELAY);
    }
    exit;
  }
 
  # handle requests within SIP dialogs
  route(WITHINDLG);
 
  ### only initial requests (no To tag)
 
  t_check_trans();
 
  # authentication
  route(AUTH);
 
  # 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();
 
  # account only INVITEs
  if (is_method("INVITE"))
  {
    setflag(FLT_ACC); # do accounting
  }
 
  # dispatch requests to foreign domains
  route(SIPOUT);
 
  ### requests for my local domains
 
  # handle presence related requests
  route(PRESENCE);
 
  # handle registrations
  route(REGISTRAR);
 
  if ($rU==$null)
  {
    # request with no Username in RURI
    sl_send_reply("484","Address Incomplete");
    exit;
  }
 
  # dispatch destinations to PSTN
  route(PSTN);
 
  #!ifdef WITH_FREESWITCH
  # save callee ID
  $avp(callee) = $rU;
  route(FSDISPATCH);
  #!endif
  # user location service
  route(LOCATION);
  route(RELAY);
}
 
 
route[RELAY] {
 
  # enable additional event routes for forwarded requests
  # - serial forking, RTP relaying handling, a.s.o.
  if (is_method("INVITE|BYE|SUBSCRIBE|UPDATE")) {
    if(!t_is_set("branch_route")) t_on_branch("MANAGE_BRANCH");
  }
  if (is_method("INVITE|SUBSCRIBE|UPDATE")) {
    if(!t_is_set("onreply_route")) t_on_reply("MANAGE_REPLY");
  }
  if (is_method("INVITE")) {
    if(!t_is_set("failure_route")) t_on_failure("MANAGE_FAILURE");
  }
 
  if (!t_relay()) {
    sl_reply_error();
  }
  exit;
}
 
# Per SIP request initial checks
route[REQINIT] {
#!ifdef WITH_ANTIFLOOD
  # flood dection from same IP and traffic ban for a while
  # be sure you exclude checking trusted peers, such as pstn gateways
  # - local host excluded (e.g., loop to self)
  if(src_ip!=myself)
  {
    if($sht(ipban=>$si)!=$null)
    {
      # ip is already blocked
      xdbg("request from blocked IP - $rm from $fu (IP:$si:$sp)\n");
      exit;
    }
    if (!pike_check_req())
    {
      xlog("L_ALERT","ALERT: pike blocking $rm from $fu (IP:$si:$sp)\n");
      $sht(ipban=>$si) = 1;
      exit;
    }
  }
#!endif
 
  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()) {
    # sequential request withing a dialog should
    # take the path determined by record-routing
    if (loose_route()) {
#!ifdef WITH_WEBSOCKETS
      if ($du == "") {
        if (!handle_ruri_alias()) {
          xlog("L_ERR", "Bad alias <$ru>\n");
          sl_send_reply("400", "Bad Request");
          exit;
        }
      }
#!endif
      route(DLGURI);
      if (is_method("BYE")) {
        setflag(FLT_ACC); # do accounting ...
        setflag(FLT_ACCFAILED); # ... even if the transaction fails
      }
      else if ( is_method("ACK") ) {
        # ACK is forwarded statelessy
        route(NATMANAGE);
      }
      else if ( is_method("NOTIFY") ) {
        # Add Record-Route for in-dialog NOTIFY as per RFC 6665.
        record_route();
      }
      route(RELAY);
    } else {
      if (is_method("SUBSCRIBE") &amp;&amp; uri == myself) {
        # in-dialog subscribe requests
        route(PRESENCE);
        exit;
      }
      if ( is_method("ACK") ) {
        if ( t_check_trans() ) {
          # no loose-route, but stateful ACK;
          # must be an ACK after a 487
          # or e.g. 404 from upstream server
          route(RELAY);
          exit;
        } else {
          # ACK without matching transaction ... ignore and discard
          exit;
        }
      }
      sl_send_reply("404","Not here");
    }
    exit;
  }
}
 
# Handle SIP registrations
route[REGISTRAR] {
  if (is_method("REGISTER"))
  {
    if(isflagset(FLT_NATS))
    {
      setbflag(FLB_NATB);
      # uncomment next line to do SIP NAT pinging 
      ## setbflag(FLB_NATSIPPING);
    }
    if (!save("location"))
      sl_reply_error();
 
    exit;
  }
}
 
# USER location service
route[LOCATION] {
 
#!ifdef WITH_SPEEDDIAL
  # search for short dialing - 2-digit extension
  if($rU=~"^[0-9][0-9]$")
    if(sd_lookup("speed_dial"))
      route(SIPOUT);
#!endif
 
#!ifdef WITH_ALIASDB
  # search in DB-based aliases
  if(alias_db_lookup("dbaliases"))
    route(SIPOUT);
#!endif
 
  $avp(oexten) = $rU;
  if (!lookup("location")) {
    $var(rc) = $rc;
    route(TOVOICEMAIL);
    t_newtran();
    switch ($var(rc)) {
      case -1:
      case -3:
        send_reply("404", "Not Found");
        exit;
      case -2:
        send_reply("405", "Method Not Allowed");
        exit;
    }
  }
 
  # when routing via usrloc, log the missed calls also
  if (is_method("INVITE"))
  {
    setflag(FLT_ACCMISSED);
  }
 
}
 
# Presence server route
route[PRESENCE] {
  if(!is_method("PUBLISH|SUBSCRIBE"))
    return;
 
#!ifdef WITH_PRESENCE
  if (!t_newtran())
  {
    sl_reply_error();
    exit;
  };
 
  if(is_method("PUBLISH"))
  {
    handle_publish();
    t_release();
  }
  else
  if( is_method("SUBSCRIBE"))
  {
    handle_subscribe();
    t_release();
  }
  exit;
#!endif
 
  # if presence enabled, this part will not be executed
  if (is_method("PUBLISH") || $rU==$null)
  {
    sl_send_reply("404", "Not here");
    exit;
  }
  return;
}
 
# Authentication route
route[AUTH] {
#!ifdef WITH_AUTH
 
#!ifdef WITH_IPAUTH
  if((!is_method("REGISTER")) &amp;&amp; allow_source_address())
  {
    # source IP allowed
    return;
  }
#!endif
#!ifdef WITH_FREESWITCH
  if(route(FSINBOUND))
    return;
#!endif
 
  if (is_method("REGISTER") || from_uri==myself)
  {
    # authenticate requests
    if (!auth_check("$fd", "subscriber", "1")) {
      auth_challenge("$fd", "0");
      exit;
    }
    # user authenticated - remove auth header
    if(!is_method("REGISTER|PUBLISH"))
      consume_credentials();
  }
  # if caller is not local subscriber, then check if it calls
  # a local destination, otherwise deny, not an open relay here
  if (from_uri!=myself &amp;&amp; uri!=myself)
  {
    sl_send_reply("403","Not relaying");
    exit;
  }
 
#!endif
  return;
}
 
# Caller NAT detection route
route[NATDETECT] {
#!ifdef WITH_NAT
  force_rport();
  if (nat_uac_test("19")) {
    if (is_method("REGISTER")) {
      fix_nated_register();
    } else {
      add_contact_alias();
    }
    setflag(FLT_NATS);
  }
#!endif
  return;
}
 
# RTPProxy control
route[NATMANAGE] {
#!ifdef WITH_NAT
  if (is_request()) {
    if(has_totag()) {
      if(check_route_param("nat=yes")) {
        setbflag(FLB_NATB);
      }
    }
  }
  if (!(isflagset(FLT_NATS) || isbflagset(FLB_NATB)))
    return;
 
  rtpproxy_manage();
 
  if (is_request()) {
    if (!has_totag()) {
      add_rr_param(";nat=yes");
    }
  }
  if (is_reply()) {
    if(isbflagset(FLB_NATB)) {
      add_contact_alias();
    }
  }
#!endif
  return;
}
 
# URI update for dialog requests
route[DLGURI] {
#!ifdef WITH_NAT
  if(!isdsturiset()) {
    handle_ruri_alias();
  }
#!endif
  return;
}
 
# Routing to foreign domains
route[SIPOUT] {
  if (!uri==myself)
  {
    append_hf("P-hint: outbound\r\n");
    route(RELAY);
  }
}
 
# PSTN GW routing
route[PSTN] {
#!ifdef WITH_PSTN
  # check if PSTN GW IP is defined
  if (strempty($sel(cfg_get.pstn.gw_ip))) {
    xlog("SCRIPT: PSTN rotuing enabled but pstn.gw_ip not defined\n");
    return;
  }
 
  # route to PSTN dialed numbers starting with '+' or '00'
  #     (international format)
  # - update the condition to match your dialing rules for PSTN routing
  if(!($rU=~"^(\+|00)[1-9][0-9]{3,20}$"))
    return;
 
  # only local users allowed to call
  if(from_uri!=myself) {
    sl_send_reply("403", "Not Allowed");
    exit;
  }
 
  if (strempty($sel(cfg_get.pstn.gw_port))) {
    $ru = "sip:" + $rU + "@" + $sel(cfg_get.pstn.gw_ip);
  } else {
    $ru = "sip:" + $rU + "@" + $sel(cfg_get.pstn.gw_ip) + ":"
          + $sel(cfg_get.pstn.gw_port);
  }
 
  route(RELAY);
  exit;
#!endif
 
  return;
}
 
# XMLRPC routing
#!ifdef WITH_XMLRPC
route[XMLRPC] {
  # allow XMLRPC from localhost
  if ((method=="POST" || method=="GET")
      &amp;&amp; (src_ip==127.0.0.1)) {
    # close connection only for xmlrpclib user agents (there is a bug in
    # xmlrpclib: it waits for EOF before interpreting the response).
    if ($hdr(User-Agent) =~ "xmlrpclib")
      set_reply_close();
    set_reply_no_connect();
    dispatch_rpc();
    exit;
  }
  send_reply("403", "Forbidden");
  exit;
}
#!endif
 
# route to voicemail server
route[TOVOICEMAIL] {
#!ifdef WITH_VOICEMAIL
  if(!is_method("INVITE"))
    return;
 
  # check if VoiceMail server IP is defined
  if (strempty($sel(cfg_get.voicemail.srv_ip))) {
    xlog("SCRIPT: VoiceMail rotuing enabled but IP not defined\n");
    return;
  }
  if($avp(oexten)==$null)
    return;
 
  $ru = "sip:" + $avp(oexten) + "@" + $sel(cfg_get.voicemail.srv_ip)
        + ":" + $sel(cfg_get.voicemail.srv_port);
  route(RELAY);
  exit;
#!endif
 
  return;
}
 
#!ifdef WITH_FREESWITCH
# FreeSWITCH routing blocks
route[FSINBOUND] {
  if($si== $sel(cfg_get.freeswitch.bindip)
      &amp;&amp; $sp==$sel(cfg_get.freeswitch.bindport))
    return 1;
  return -1;
}
route[FSDISPATCH] {
  if(!is_method("INVITE"))
    return;
  if(route(FSINBOUND))
    return;
  # dial number selection
  switch($rU) {
    case /"^41$":
      # 41 - voicebox menu
      # allow only authenticated users
      if($au==$null)
      {
        sl_send_reply("403", "Not allowed");
        exit;
      }
      $rU = "vm-" + $au;
    break;
    case /"^441[0-9][0-9]$":
      # starting with 44 folowed by 1XY - direct call to voice box
      strip(2);
      route(FSVBOX);
    break;
    case /"^433[0-9][0-9][0-9]$":
      # starting with 433 folowed by (0|1)XY - conference
      strip(2);
    break;
    case /"^45[0-9]+$":
      strip(2);
    break;
    default:
      # offline - send to voicebox
      if (!registered("location"))
      {
        route(FSVBOX);
        exit;
      }
      # online - do bridging
      prefix("kb-");
      if(is_method("INVITE"))
      {
        # in case of failure - re-route to FreeSWITCH VoiceMail
        t_on_failure("FAIL_FSVBOX");
      }
  }
  route(FSRELAY);
  exit;
}
route[FSVBOX] {
  if(!($rU=~"^1[0-9][0-9]+$"))
    return;
  prefix("vb-");
  route(FSRELAY);
}
# Send to FreeSWITCH
route[FSRELAY] {
  $du = "sip:" + $sel(cfg_get.freeswitch.bindip) + ":"
      + $sel(cfg_get.freeswitch.bindport);
  route(RELAY);
  exit;
}
#!endif
# manage outgoing branches
branch_route[MANAGE_BRANCH] {
  xdbg("new branch [$T_branch_idx] to $ru\n");
  route(NATMANAGE);
}
 
# manage incoming replies
onreply_route[MANAGE_REPLY] {
  xdbg("incoming reply\n");
  if(status=~"[12][0-9][0-9]")
    route(NATMANAGE);
}
 
# manage failure routing cases
failure_route[MANAGE_FAILURE] {
  route(NATMANAGE);
 
  if (t_is_canceled()) {
    exit;
  }
 
#!ifdef WITH_BLOCK3XX
  # block call redirect based on 3xx replies.
  if (t_check_status("3[0-9][0-9]")) {
    t_reply("404","Not found");
    exit;
  }
#!endif
 
#!ifdef WITH_VOICEMAIL
  # serial forking
  # - route to voicemail on busy or no answer (timeout)
  if (t_check_status("486|408")) {
    route(TOVOICEMAIL);
    exit;
  }
#!endif
}
 
#!ifdef WITH_WEBSOCKETS
onreply_route {
  if ((($Rp == MY_WS_PORT || $Rp == MY_WSS_PORT)
    &amp;&amp; !(proto == WS || proto == WSS)) || $Rp == MY_MSRP_PORT) {
    xlog("L_WARN", "SIP response received on $Rp\n");
    drop;
    exit;
  }
 
  if (nat_uac_test(64)) {
    # Do NAT traversal stuff for replies to a WebSocket connection
    # - even if it is not behind a NAT!
    # This won't be needed in the future if Kamailio and the
    # WebSocket client support Outbound and Path.
    add_contact_alias();
  }
}
 
event_route[xhttp:request] {
  set_reply_close();
  set_reply_no_connect();
 
  if ($Rp != MY_WS_PORT
#!ifdef WITH_TLS
      &amp;&amp; $Rp != MY_WSS_PORT
#!endif
  ) {
    xlog("L_WARN", "HTTP request received on $Rp\n");
    xhttp_reply("403", "Forbidden", "", "");
    exit;
  }
 
  xlog("L_DBG", "HTTP Request Received\n");
 
  if ($hdr(Upgrade)=~"websocket"
      &amp;&amp; $hdr(Connection)=~"Upgrade"
      &amp;&amp; $rm=~"GET") {
 
    # Validate Host - make sure the client is using the correct
    # alias for WebSockets
    # Sasa: commented out, see http://sip-router.1086192.n5.nabble.com/Testing-the-Websocket-module-with-sipml5-org-td65069.html
    #if ($hdr(Host) == $null || !is_myself("sip:" + $hdr(Host))) {
    #  xlog("L_WARN", "Bad host $hdr(Host)\n");
    #  xhttp_reply("403", "Forbidden", "", "");
    #  exit;
    #}
 
    # Optional... validate Origin - make sure the client is from an
    # authorised website.  For example,
    #
    # if ($hdr(Origin) != "http://communicator.MY_DOMAIN"
    #     &amp;&amp; $hdr(Origin) != "https://communicator.MY_DOMAIN") {
    #  xlog("L_WARN", "Unauthorised client $hdr(Origin)\n");
    #  xhttp_reply("403", "Forbidden", "", "");
    #  exit;
    # }
 
    # Optional... perform HTTP authentication
 
    # ws_handle_handshake() exits (no further configuration file
    # processing of the request) when complete.
    if (ws_handle_handshake())
    {
      # Optional... cache some information about the
      # successful connection
      exit;
    }
  }
 
  xhttp_reply("404", "Not Found", "", "");
}
 
event_route[websocket:closed] {
  xlog("L_INFO", "WebSocket connection from $si:$sp has closed\n");
}
#!endif
 
#!ifdef WITH_MSRP
event_route[msrp:frame-in] {
  msrp_reply_flags("1");
 
  if ((($Rp == MY_WS_PORT || $Rp == MY_WSS_PORT)
    &amp;&amp; !(proto == WS || proto == WSS)) &amp;&amp; $Rp != MY_MSRP_PORT) {
    xlog("L_WARN", "MSRP request received on $Rp\n");
    msrp_reply("403", "Action-not-allowed");
    exit;
  }
 
  if (msrp_is_reply()) {
    msrp_relay();
  } else if($msrp(method)=="AUTH") {
    if($msrp(nexthops)>0) {
      msrp_relay();
      exit;
    }
 
    if (!www_authenticate("MY_DOMAIN", "subscriber",
          "$msrp(method)")) {
      if (auth_get_www_authenticate("MY_DOMAIN", "1",
              "$var(wauth)")) {
        msrp_reply("401", "Unauthorized",
              "$var(wauth)");
      } else {
        msrp_reply("500", "Server Error");
      }
      exit;
    }
 
    if ($hdr(Expires) != $null) {
      $var(expires) = (int) $hdr(Expires);
      if ($var(expires) < MSRP_MIN_EXPIRES) {
        msrp_reply("423", "Interval Out-of-Bounds",
          "Min-Expires: MSRP_MIN_EXPIRES\r\n");
        exit;
      } else if ($var(expires) > MSRP_MAX_EXPIRES) {
        msrp_reply("423", "Interval Out-of-Bounds",
          "Max-Expires: MSRP_MAX_EXPIRES\r\n");
        exit;
      }
    } else {
      $var(expires) = MSRP_MAX_EXPIRES;
    }
 
    $var(cnt) = $var(cnt) + 1;
    pv_printf("$var(sessid)", "s.$(pp).$(var(cnt)).$(RANDOM)");
    $sht(msrp=>$var(sessid)::srcaddr) = $msrp(srcaddr);
    $sht(msrp=>$var(sessid)::srcsock) = $msrp(srcsock);
    $shtex(msrp=>$var(sessid)) = $var(expires) + 5;
    # - Use-Path: the MSRP address for server + session id
    $var(hdrs) = "Use-Path: msrps://MY_IP_ADDR:MY_MSRP_PORT/"
          + $var(sessid) + ";tcp\r\n"
          + "Expires: " + $var(expires) + "\r\n";
    msrp_reply("200", "OK", "$var(hdrs)");
  } else if ($msrp(method)=="SEND" || $msrp(method)=="REPORT") {
    if ($msrp(nexthops)>1) {
      if ($msrp(method)!="REPORT") {
        msrp_reply("200", "OK");
      }
      msrp_relay();
      exit;
    }
    $var(sessid) = $msrp(sessid);
    if ($sht(msrp=>$var(sessid)::srcaddr) == $null) {
      # one more hop, but we don't have address in htable
      msrp_reply("481", "Session-does-not-exist");
      exit;
    } else if ($msrp(method)!="REPORT") {
      msrp_reply("200", "OK");
    }
    msrp_relay_flags("1");
    msrp_set_dst("$sht(msrp=>$var(sessid)::srcaddr)",
        "$sht(msrp=>$var(sessid)::srcsock)");
    msrp_relay();
  } else {
    msrp_reply("501", "Request-method-not-understood");
  }
}
#!endif
 
#!ifdef WITH_FREESWITCH
failure_route[FAIL_FSVBOX] {
#!ifdef WITH_NAT
  if (is_method("INVITE")
      &amp;&amp; (isbflagset(FLB_NATB) || isflagset(FLT_NATS))) {
    unforce_rtp_proxy();
  }
#!endif
 
  if (t_is_canceled()) {
    exit;
  }
 
  if (t_check_status("486|408")) {
    # re-route to FreeSWITCH VoiceMail
    $rU = $avp(callee);
    route(FSVBOX);
  }
}
#!endif
 

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