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http://opensips.com.br/wiki/index.php?title=Oopensips_Nat_script_with_RTPPROXY_-_English


First of all, my english is not so good as i want, but im writing this in english too because i ever see a lot of people asking about nat problems, so if you find something wrong on my english translation please fix that.


Nat is something that need some work to understand how to use with opensips, is different from what we know on asterisk where you just need to set nat=yes and everything work fine.


I will not show how to install opensips or rtpproxy because we have other howto's here that show this, i will just show the opensips.cfg route script with a simple configuration to accept register and relay the call from a user to another over nat.

The script does not need any user created on opensips, any authentication will be accepted and if you do a restart on opensips you need to register the account again because the location information is just on the memory.


There is a lot of ways to make this, using variables and other functions, this way is simple, is for understand, you can your own implementation as you want.

opensips.cfg

###################################
# This script have only the purpose of show you
# how configure opensips to work over a nat network
# 
#
# YOU SHOULD CHANGE THIS: ___IP_DO_OPENSIPS_AQUI___
# TO THE IP ADDRESS FROM YOUR SERVER
###################################


####### Parametros Globais #########

debug=3
log_stderror=no
log_facility=LOG_LOCAL0

fork=yes
children=4

/* uncomment the lins below to increase the debug level */
#debug=6
#fork=no
#log_stderror=yes

auto_aliases=no

# Ip address where opensips will run
listen=udp:___IP_DO_OPENSIPS_AQUI___:5060  

# disable support for sip over tcp
disable_tcp=yes

# disable tls support
disable_tls=yes


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

# Opensips module directory
mpath="/usr//lib64/opensips/modules/"

#### signialing module 
loadmodule "signaling.so"

#### stateless module
loadmodule "sl.so"

#### transaction module
loadmodule "tm.so"
modparam("tm", "fr_timer", 5)
modparam("tm", "fr_inv_timer", 30)
modparam("tm", "restart_fr_on_each_reply", 0)
modparam("tm", "onreply_avp_mode", 1)

#### record route module
loadmodule "rr.so"
modparam("rr", "append_fromtag", 0)

#### max forward module
loadmodule "maxfwd.so"

#### sip message operations module
loadmodule "sipmsgops.so"

#### fifo management interface 
loadmodule "mi_fifo.so"
modparam("mi_fifo", "fifo_name", "/tmp/opensips_fifo")
modparam("mi_fifo", "fifo_mode", 0666)

#### uri module
loadmodule "uri.so"
modparam("uri", "use_uri_table", 0)

#### user location module
loadmodule "usrloc.so"
modparam("usrloc", "nat_bflag", "NAT")
modparam("usrloc", "db_mode",   0)

#### registrar module
loadmodule "registrar.so"


#### nathelper module
loadmodule "nathelper.so"
modparam("nathelper", "natping_interval", 10)
modparam("nathelper", "natping_socket", "___IP_DO_OPENSIPS_AQUI___:5060")
modparam("nathelper", "received_avp", "$avp(42)")
#modparam("nathelper", "sipping_bflag", "SIP_PING_FLAG")
modparam("nathelper", "sipping_from", "sip:pinger@___IP_DO_OPENSIPS_AQUI___")
modparam("nathelper", "sipping_method", "OPTIONS")


#### Modulo rtpproxy (forcar o audio atraves do opensips)
loadmodule "rtpproxy.so"
modparam("rtpproxy", "rtpproxy_sock", "udp:localhost:7890")


#######  routing logic ########



route{


	if (!mf_process_maxfwd_header("10")) {
		sl_send_reply("483","Too Many Hops");
		exit;
	}



	if (has_totag()) {
		# sequential request withing a dialog should
                # take the path determined by record-routing
		if (loose_route()) {
			xlog("We are on has_totag - loose_route");
			if (is_method("INVITE")) {
				record_route();
			}

			route(relay);
		} else {
			if ( is_method("ACK") ) {
				if ( t_check_trans() ) {
					t_relay();
					exit;
				} else {
					xlog("We are on has_totag, our method is not ACK [ $rm ] ");
					# ACK without matching transaction ->
                                        # ignore and discard
					exit;
				}
			}
			
			sl_send_reply("404","Not here");
		}
		exit;
	}

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

	t_check_trans();

	
	if ( !(is_method("REGISTER")  ) ) {

		if (from_uri==myself)
		{
		} else {
			# if caller is not local, then called number must be local
			if (!uri==myself) {
				send_reply("403","Rely forbidden");
				exit;
			}
		}
	}

	# preloaded route checking
	if (loose_route()) {
		xlog("L_ERR",
		"Attempt to route with preloaded Route's [$fu/$tu/$ru/$ci]");
		if (!is_method("ACK"))
			sl_send_reply("403","Preload Route denied");
		exit;
	}

	# record routing
	if (!is_method("REGISTER|MESSAGE"))
		record_route();


	# If we are not the final destination the call is
	# to a external destination
	if (!uri==myself) {
		append_hf("P-hint: outbound\r\n"); 
		route(relay);
	}

	# We dont accept publish or subscribe here
	if (is_method("PUBLISH|SUBSCRIBE"))
	{
		sl_send_reply("503", "Service Unavailable");
		exit;
	}


	if (is_method("REGISTER"))
	{

		# we receive a register request
		# we will execute fix_nated_register nad fix_nated_contact
		fix_nated_register();
		fix_nated_contact();

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

		exit;
	}

	if ($rU==NULL) {
		#requisicao com endereco incompleto
		sl_send_reply("484","Address Incomplete");
		exit;
	}

	# do lookup with method filtering
	if (!lookup("location","m")) {
		t_newtran();
		t_reply("404", "Not Found");
		exit;
	} 

	route(relay);
}


route[relay] {

	# check if this request is a invite
	
	if (is_method("INVITE")) {
		# for each branch we will call the function below
		
		t_on_branch("per_branch_ops");

		# for each reply we will call the function below
		
		t_on_reply("handle_nat");

		# if the call was not completed, so failure route
		t_on_failure("missed_call");


		# lets try to identify if the user is behind a nat
                # you can check the mean of 127 on
                # http://www.opensips.org/html/docs/modules/1.9.x/nathelper.html#id292854
                # 127 = 1111111 (activate all check)
		if(nat_uac_test("127")){
			# user identified as behing a nat
			xlog("we are on route relay, user behind nat");
			fix_nated_contact();
		}

		# if we have an application/sdp on our body, so we execute
                # the rtpproxy_offer
		if(has_body("application/sdp")){
			xlog("we have sdp on this $rm");
			rtpproxy_offer();
		}
	

	}

	# removing the rtpproxy session
	if(is_method("CANCEL|BYE")){
		unforce_rtp_proxy();
	}


	
	if (!t_relay()) {
		send_reply("500","Internal Error");
	};
	exit;
}


branch_route[per_branch_ops] {

	xlog("new branch at $ru\n");
}


onreply_route[handle_nat] {

	xlog("incoming reply\n");
	
	# we receive a reply, we need to check about application/sdp 
        # on our body, if we have, we answer that
	if(is_method("ACK") && has_body("application/sdp")){
		
		rtpproxy_answer();

	}else if(has_body("application/sdp")){
		# offering rtpproxy on a non ack message
		rtpproxy_offer();	
	}


	# here we try to identify if the user is behind a nat again
        # but now is the second user (the called user) 
	if(nat_uac_test("127")){
		
		xlog("we are on nat handle , user behind nat, fixing contact");
		fix_nated_contact();
	}
}


failure_route[missed_call] {
	
	if (t_was_cancelled()) {
		exit;
	}

}

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