[SR-Users] Rtpproxy - IPv4/v6 Translation and earlier removing of session

Thu Apr 11 12:53:05 CEST 2013

Hi,

I started working on IPv4/IPv6 Translation issue in Kamailio by using rtpproxy as Media relay last year in my Bachelor-project.
I solved the trouble with Translation between IPv4 and IPv6 clients, where IPv4 client used public IPv4 address. Now I am working on the issue, where
IPv4 client uses private IPv4 (is behind NAT in local network), so I have to provide IPv4/v6 and NAT for all messages in one call. 

My topology consists of:
Kamailio 3.3.4 - SIPproxy (supports IPv4/IPv6, public IPv4 and IPv6 addresses) - makes NAT translation, works as SIPoutbound proxy and communicates with rtpproxy (v1.2.1), 
Kamailio 3.3.4 - SIPprotocol GW (== SIP bridge) - translates IPv4 messages to IPv6 (and IPv6 to IPv4), uses other rtpproxy, has public IPv4 and IPv6 addresses
+ only IPv4 and only IPv6 clients (Linphone v3.5.2)

I assume, that both (IPv4 and IPv6) clients are in the same SIP domain.
I solve IPv4-IPv6 translation so, that each message from IPv6 client goes to SIP proxy and (if needed) is forwarded to SIP Protocol GW. Translated medssage is then forwarded back to SIP proxy and from that to callee.                                       

Here i have some problems:
-1.) IPv6 client doesnt respond to invites from IPv4 client. The messages are ignored at IPv6 client.

-2.) Rtpproxy on the machine with SIP protocol gateway (which provides IPv4/v6 translation) removes session earlier than I need (usually after 30 seconds of call) and the result is call break.
this issue doesnt appear for rtpproxy on SIP proxy. I dont know what causes this behavior, if it is only in some parameters, witch i have to set, or it is bug in rtpproxy or .... 

Here I get config files of topology entities:

-----------------------------------------------------------------------------------------------------------------------------
config file for SIP proxy:
----------------------------------------------------------------------------------------------------------------------------- 
#!KAMAILIO
# Konfiguracny subor pre SIP Proxy Server IPv4/IPv6 pre konkretnu domenu ip02.sip.uniza.sk
#
#!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

####### Defined Values #########
#!define WITH_MYSQL
#!define WITH_AUTH
#!define WITH_USERLOCDB
#!define WITH_ALIASDB
#!define WITH_NAT

#>>
#!define WITH_IPV6
#!define WITH_V4V6

#!ifdef WITH_V4V6
#!define BRIDGE_IP4 "158.193.139.207"
#!define BRIDGE_IP6 "[2001:4118:300:122:a00:27ff:fe60:83c]"
#!endif
#<<

#!define ADDR_IP4 158.193.139.46

#!ifdef WITH_IPV6
#!define ADDR_IP6 [2001:4118:300:122:444a:3fff:fecc:61a0] 
#!endif

# *** 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.
#!define DBURL "mysql://openser:openserrw@localhost/openser"
#!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 1 
#!define FLB_NATSIPPING 2

#>>
#!define FLB_IPV6 6
#!define FLB_V4V6 7
#<<
####### Global Parameters #########

#!ifdef WITH_DEBUG
debug=4
log_stderror=yes
#!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="ip02.sip.uniza.sk"
alias="[2001:4118:300:122:444a:3fff:fecc:61a0]" 
alias="158.193.139.46"

#!ifdef WITH_IPV6
listen=udp:158.193.139.46:5060
listen=udp:[2001:4118:300:122:444a:3fff:fecc:61a0]:5060
listen=tcp:158.193.139.46:5060
listen=tcp:[2001:4118:300:122:444a:3fff:fecc:61a0]:5060

#!else
/* 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
#!endif

/* 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

# 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"
#!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.srv_port = "" desc ""
#!endif

#>>
#!ifdef WITH_V4V6
bridge.srv_ip4 = "" desc "SIPv64 PGW IPv4 Address"
bridge.srv_ip6 = "" desc "SIPv64 PGW IPv6 Address"
#!endif
#<<

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

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

#!ifdef WITH_MYSQL
loadmodule "db_mysql.so"
#!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 "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_V4V6
loadmodule "ipops.so"
loadmodule "exec.so"
#!endif
#<<

#!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_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 ---------------

#>>
# ----- xlog params -----
modparam("xlog", "prefix", "ProxyLog: ")
#<<

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

# ----- 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

# ----- speedial 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)
modparam("presence", "db_update_period", 20)

# ----- presence_xml params -----
modparam("presence_xml", "db_url", DBURL)
modparam("presence_xml", "force_active", 0)
#!endif

#!ifdef WITH_XCAPSRV
# ----- xcap_server params -----
modparam("xcap_server", "db_url", DBURL)
#!endif

#!ifdef WITH_NAT
# ----- rtpproxy params -----
modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:22222")

# ----- 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 at ip02.sip.uniza.sk")

# 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", "/etc/kamailio/tls.cfg")
#!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);

 # NAT detection
 route(NATDETECT);

 # CANCEL processing
 if (is_method("CANCEL"))
 {
 if (t_check_trans())
 t_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);

 # user location service
 route(LOCATION);

 route(RELAY);
}

#>>
route[INDOMAIN]{
#!ifdef WITH_V4V6
 ## if calle in local domain and V4/V6 translation needed ->
 ## -> rewrite IP in SIP URI back to other version of SIP domain IP
 if(!has_totag() && isbflagset(FLB_V4V6) && lookup('location')){
 xlog("L_INFO","URI domain before change: $rd\n");
 if(af == INET){
 $ru="sip:" + $rU + "@" + "[2001:4118:300:122:444a:3fff:fecc:61a0]"+":"+$rp;
 }else{
 $ru="sip:" + $rU + "@" + "158.193.139.46" + ":"+$rp;
 }
 xlog("L_INFO","Request URI after rewrite: $ru\n"); 
 }
#!endif
 return;
}
#<<

#>>
route[FROMBRIDGE]{
 if($si==BRIDGE_IP6 || $si==BRIDGE_IP4){
 return 1;
 }
 return -1;
}

route[TOBRIDGE]{
#!ifdef WITH_V4V6
 if(isbflagset(FLB_V4V6)){
 if(af == INET6){
 if(!t_relay(BRIDGE_IP6,"5060")) sl_reply_error(); 
 exit;
 }else{
 if(!t_relay(BRIDGE_IP4,"5060")) sl_reply_error(); 
 exit;
 } 
 }
#!endif
 return;
}

route[IPV4V6] {
#!ifdef WITH_V4V6 
 if (!has_totag()){ 
 if (to_uri!=myself){
 if(from_uri==myself){
 # SIP message goes from local domain out
 if(is_ip($rd)){
 # target domain defined with IP address
 if((af==INET && is_ipv6_reference($rd)) || (af==INET6 && is_ipv4($rd))) {
 setbflag(FLB_V4V6);
 }
 } else {
 # target domain in R-URI defined with domain name - DNS used 
# launch script, which returns list of IP addresses of all SIP servers, which provide that service in R-URI
 # IP addresses saved in $avp(i:1), $avp(i:2), ...

 exec_avp("/etc/kamailio/test.sh _sip._'$rP'.'$rd'.");
 if($avp(i:1) != "Unknown"){
 $var(i) = 1;
 $var(bridge) = "yes";
 while ($avp($var(i)) != 0){
 if((af==INET && is_ipv4($avp($var(i)))) || (af==INET6 && is_ipv6($avp($var(i))))) {
 # if exists IP with the same AF than AF of sender --> bridge isnt needed
 $var(bridge) = "no";
 break;
 }
 $var(i) = $var(i)+1;
 }
 xlog("L_INFO","BRIDGE > $var(bridge)");
 if($var(bridge) == "yes") {
 setbflag(FLB_V4V6);
 }
 }
 } 
 } else {
 # message is only going throught SIP server
 return;
 }  
 } else {
 if(af==INET6 && !isbflagset(FLB_IPV6)){
 setbflag(FLB_V4V6);
 } else {
 if(af==INET && isbflagset(FLB_IPV6)) {
 setbflag(FLB_V4V6);
 }
 } 
 }
 }
#!endif 
 return;
}
#<<

route[RELAY] {

 # enable additional event routes for forwarded requests
 # - serial forking, RTP relaying handling, a.s.o.
 if (is_method("INVITE|SUBSCRIBE")) {
 t_on_branch("MANAGE_BRANCH");
 t_on_reply("MANAGE_REPLY");
 }
 if (is_method("INVITE")) {
 t_on_failure("MANAGE_FAILURE");
 }

 route(IPV4V6);
 route(INDOMAIN);
 route(TOBRIDGE);

 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()) {
 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") && 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
 t_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(af==INET6)
 setbflag(FLB_IPV6);
 if (!save("location"))
 sl_reply_error();

 exit;
 }
}

# USER location service
route[LOCATION] {

#!ifdef WITH_SPEEDIAL
 # 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) = $rc;
 t_newtran();
 switch ($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_V4V6
 # messages from SIP Bridge without authentication
 if(route(FROMBRIDGE))
 return;
#!endif

#!ifdef WITH_IPAUTH
 if((!is_method("REGISTER")) && allow_source_address())
 {
 # source IP allowed
 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 && uri!=myself)
 {
 sl_send_reply("403","Not relaying");
 exit;
 }

#!endif
 return;
}

# Caller NAT detection route
route[NATDETECT] {
 # if from IPv6, NAT not needed
 if(af==INET6)   
 return;
#!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(af==INET6)
 return;

 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("froc");

 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;
 }

 $ru = "sip:" + $rU + "@" + $sel(cfg_get.pstn.gw_ip);

 route(RELAY);
 exit;
#!endif

 return;
}

# XMLRPC routing
#!ifdef WITH_XMLRPC
route[XMLRPC] {
 # allow XMLRPC from localhost
 if ((method=="POST" || method=="GET")
 && (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:" + "vmbox-" + $avp(oexten) + "@" + $sel(cfg_get.voicemail.srv_ip)
 + ":" + $sel(cfg_get.voicemail.srv_port);
 route(RELAY);
 exit;
#!endif

 return;
}

# manage outgoing branches
branch_route[MANAGE_BRANCH] {
 xdbg("new branch [$T_branch_idx] to $ru\n");
 route(IPV4V6);
 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
}
------------------------------------------------------------------------------------------------------------ config file for SIP protocol GW == SIP bridge
------------------------------------------------------------------------------------------------------------
 #!KAMAILIO
#
# Kamailio (OpenSER) SIP Server v3.2 - default configuration script
#     - web: http://www.kamailio.org
#     - git: http://sip-router.org
#
# Direct your questions about this file to: <sr-users at lists.sip-router.org>
#
# Refer to the Core CookBook at http://www.kamailio.org/dokuwiki/doku.php
# 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

####### Defined Values #########
#!define WITH_IPV6
#!define WITH_NAT
#!define WITH_V4V6
#!define WITH_BRIDGE

#!define ADDR_IP4 158.193.139.207

#!ifdef WITH_IPV6
#!define ADDR_IP6 [2001:4118:300:122:a00:27ff:fe60:83c]
#!endif

# *** 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.
#!define DBURL "mysql://openser:openserrw@localhost/kamailio"
#!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 1
#!define FLB_NATSIPPING 2
#!define FLB_V4V6 6 
####### Global Parameters #########

# DNS parametre
use_dns_cache=on
#dns_try_ipv6=yes

#!ifdef WITH_DEBUG
debug=4
log_stderror=yes
#!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="bridge.local"
alias="[2001:4118:300:122:a00:27ff:fe60:83c]"
alias="158.193.139.207"

#!ifdef WITH_IPV6
listen=ADDR_IP4
listen=ADDR_IP6
#!else
/* 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
#!endif

/* 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

# 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"
#!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

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

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

#!ifdef WITH_MYSQL
loadmodule "db_mysql.so"
#!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 "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_V4V6
loadmodule "ipops.so"
loadmodule "exec.so"
#!endif

#!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_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)

# ----- 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

# ----- speedial 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)
# use caching
modparam("domain", "db_mode", 1)
# 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:127.0.0.1:22222")
#modparam("rtpproxy", "rtpproxy_sock", "unix:/var/run/rtpproxy/rtpproxy.sock")
# ----- 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 at 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", "/etc/kamailio/tls.cfg")
#!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(BRIDGE);

 route(REQINIT);

 # NAT detection
 route(NATDETECT);

 # handle requests within SIP dialogs
 route(WITHINDLG);

 ### only initial requests (no To tag)

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

 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);

 # user location service
 route(LOCATION);

 route(RELAY);
}

route[BRIDGE]{
#!ifdef WITH_BRIDGE
 if(to_uri!=myself && from_uri!=myself){
 # message goes only throught this server - BRIDGE
 # => translation provided
 setbflag(FLB_V4V6);
 }
#!endif
 return;
}

route[RELAY] {

 # enable additional event routes for forwarded requests
 # - serial forking, RTP relaying handling, a.s.o.
 if (is_method("INVITE|SUBSCRIBE")) {
 t_on_branch("MANAGE_BRANCH");
 t_on_reply("MANAGE_REPLY");
 }
 if (is_method("INVITE")) {
 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()) {
 if (is_method("BYE")) {
 setflag(FLT_ACC); # do accounting ...
 setflag(FLT_ACCFAILED); # ... even if the transaction fails
 }
 if ( is_method("ACK") ) {
 # ACK is forwarded statelessy
 route(NATMANAGE);
 }
 route(RELAY);
 } else {
 if (is_method("SUBSCRIBE") && 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
 t_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_SPEEDIAL
 # 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
 if (is_method("REGISTER"))
 {
 # authenticate the REGISTER requests (uncomment to enable auth)
 if (!www_authorize("$td", "subscriber"))
 {
 www_challenge("$td", "0");
 exit;
 }

 if ($au!=$tU)
 {
 sl_send_reply("403","Forbidden auth ID");
 exit;
 }
 } else {

#!ifdef WITH_IPAUTH
 if(allow_source_address())
 {
 # source IP allowed
 return;
 }
#!endif

 # authenticate if from local subscriber
 if (from_uri==myself)
 {
 if (!proxy_authorize("$fd", "subscriber")) {
 proxy_challenge("$fd", "0");
 exit;
 }
 if (is_method("PUBLISH"))
 {
 if ($au!=$fU || $au!=$tU) {
 sl_send_reply("403","Forbidden auth ID");
 exit;
 }
 if ($au!=$rU) {
 sl_send_reply("403","Forbidden R-URI");
 exit;
 }
#!ifdef WITH_MULTIDOMAIN
 if ($fd!=$rd) {
 sl_send_reply("403","Forbidden R-URI domain");
 exit;
 }
#!endif
 } else {
 if ($au!=$fU) {
 sl_send_reply("403","Forbidden auth ID");
 exit;
 }
 }

 consume_credentials();
 # caller authenticated
 } else {
 # caller is not local subscriber, then check if it calls
 # a local destination, otherwise deny, not an open relay here
 if (!uri==myself)
 {
 sl_send_reply("403","Not relaying");
 exit;
 }
 }
 }
#!endif
 return;
}

# Caller NAT detection route
route[NATDETECT] {
 # if from IPv6, NAT not needed
 if(af==INET6)   
 return;
#!ifdef WITH_NAT
 force_rport();
 if (nat_uac_test("19")) {
 if (is_method("REGISTER")) {
 fix_nated_register();
 } else {
 fix_nated_contact();
 }
 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);
 }else {
 if(check_route_param("nat=v46")) {
 setbflag(FLB_V4V6);
 }
 }
 }
 }

 if (!(isflagset(FLT_NATS) || isbflagset(FLB_NATB)|| isbflagset(FLB_V4V6)))   
 return;

 #rtpproxy_manage();
 if(isbflagset(FLB_V4V6)) {
 if(af==INET6) {
 rtpproxy_manage("FAEI");
 } else {
 rtpproxy_manage("FAIE");
 }
 } else {
 if(af==INET6) {
 # zroj aj ciel su IPV6
 rtpproxy_manage("FAEE");
 } else {
 # zdroj aj ciel su IPV4
 rtpproxy_manage("FAII");
 }
 }
 if (is_request()) {
 if (!has_totag()) {
 if(isbflagset(FLB_V4V6)) {
 add_rr_param(";nat=v46");
 } else {
 add_rr_param(";nat=yes");
 }
 }
 }
 if (is_reply()) {
 if(isbflagset(FLB_NATB)) {
 if(af==INET) {
 fix_nated_contact();
 }
 }
 }
#!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;
 }

 $ru = "sip:" + $rU + "@" + $sel(cfg_get.pstn.gw_ip);

 route(RELAY);
 exit;
#!endif

 return;
}

# XMLRPC routing
#!ifdef WITH_XMLRPC
route[XMLRPC] {
 # allow XMLRPC from localhost
 if ((method=="POST" || method=="GET")
 && (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;
}

# 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
}
----------------------------------------------------------------------------------------------Here some information from logging:from rtpproxy, wich translates SIP messages between IPv4 and IPv6-----------------------------------------------------------------------------------------------Apr 11 10:12:51 bridge rtpproxy[1103]: INFO:handle_command: new session 4817, tag 12674;1 requested, type strongApr 11 10:12:51 bridge rtpproxy[1103]: INFO:handle_command: new session on a port 36792 created, tag 12674;1Apr 11 10:12:51 bridge rtpproxy[1103]: INFO:handle_command: pre-filling caller's address with 2001:4118:300:122:c41b:584d:c288:90f6:7078Apr 11 10:12:51 bridge rtpproxy[1103]: INFO:handle_command: adding strong flag to existing session, new=1/0/0Apr 11 10:12:51 bridge rtpproxy[1103]: INFO:handle_command: lookup on ports 36792/0, session timer restartedApr 11 10:12:51 bridge rtpproxy[1103]: INFO:handle_command: adding strong flag to existing session, new=1/0/0Apr 11 10:12:51 bri
 dge rtpproxy[1103]: INFO:handle_command: lookup on ports 36792/0, session timer restartedApr 11 10:12:53 bridge rtpproxy[1103]: INFO:handle_command: lookup on ports 36792/52592, session timer restartedApr 11 10:12:53 bridge rtpproxy[1103]: INFO:handle_command: pre-filling callee's address with 158.193.139.46:36258>>>Apr 11 10:13:21 bridge rtpproxy[1103]: INFO:handle_delete: forcefully deleting session 1 on ports 36792/52592Apr 11 10:13:21 bridge rtpproxy[1103]: INFO:remove_session: RTP stats: 215 in from callee, 214 in from caller, 429 relayed, 0 droppedApr 11 10:13:21 bridge rtpproxy[1103]: INFO:remove_session: RTCP stats: 0 in from callee, 1 in from caller, 1 relayed, 0 droppedApr 11 10:13:21 bridge rtpproxy[1103]: INFO:remove_session: session on ports 36792/52592 is cleaned upApr 11 10:13:21 bridge rtpproxy[1103]: INFO:handle_command: delete request failed: session 4817, tags 12674/NONE not found-----------------------------------------------------------------------------
 -------------------
My problem is related to the line with >>>

If somebody has experience with this kind of problem, i will be very thankful for help.

Jakub Hrabovsky
(sorry for my english grammar)

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