####### Defined Values #########

# - 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 #########

# Enable debugging only when kamailio is mading boo-boo
### LOG Levels: 3=DBG, 2=INFO, 1=NOTICE, 0=WARN, -1=ERR
debug=3
log_stderror=no

memdbg=5
memlog=5

log_facility=LOG_LOCAL0

fork=yes
children=8

/* 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="kamaz.ikatele.com"

/* 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:50.0.0.1:5060 advertise 194.190.8.171:5060
#listen=udp:194.190.8.171:5060 advertise 50.0.0.1:5060

listen=udp:194.190.8.171
listen=udp:50.0.0.1

dns=no
rev_dns=no
check_via=yes

/* port to listen to
 * - can be specified more than once if needed to listen on many ports */
port=5060

mhomed=1

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

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

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"

loadmodule "nathelper.so"
loadmodule "rtpproxy.so"

#loadmodule "topoh.so"
#modparam("topoh", "mask_key", "balalayka")
#modparam("topoh", "mask_ip", "50.0.0.1")

# ----------------- 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", 3000)
# default invite retransmission timeout after 1xx: 120sec
modparam("tm", "fr_inv_timer", 12000)

# ----- 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", 1)

# ----- 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@194.190.8.171")

# params needed for NAT traversal in other modules
modparam("nathelper", "received_avp", "$avp(RECEIVED)")
modparam("usrloc", "nat_bflag", FLB_NATB)

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

# Main SIP request routing logic
# - processing of any incoming SIP request starts with this route
# - note: this is the same as route { ... }

route {

	# per request initial checks
	route(REQINIT);

	# NAT detection
	xlog("L_NOTICE","$rm from $fu (IP:$si:$sp) Main Route before  ---NAT---\n");

	route(NATDETECT);

	xlog("L_NOTICE","$rm from $fu (IP:$si:$sp) in Route[NATDETECT] fix_nat-register\n");

	# 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();

	# 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);

	# handle registrations
	route(REGISTRAR);

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

	route(RELAY);

}

# Per SIP request initial checks
route[REQINIT] {
	if (!mf_process_maxfwd_header("20")) {
	xlog("L_NOTICE","$rm from $fu (IP:$si:$sp) in MAX FDW HEADERS ALARMO\n");

		sl_send_reply("483","Too Many Hops");
		exit;
	}

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

# Caller NAT detection route
route[NATDETECT] {
	force_rport();
	if (nat_uac_test("19")) {
		if (is_method("REGISTER")) {
			fix_nated_register();
		} else {
			if(is_first_hop())
				set_contact_alias();
		}
		setflag(FLT_NATS);

	}
	return;
}

# 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("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 {
					xlog("L_NOTICE","ACK without matching transaction ... ignore and discard\n");
					# ACK without matching transaction ... ignore and discard
					exit;
				}
			}
			sl_send_reply("404","Not here");
		}
		exit;
	}
}

# Routing to foreign domains
route[SIPOUT] {
        if (!uri==myself)
        {
                append_hf("P-hint: outbound\r\n");
                route(RELAY);
        }
}
# Handle SIP registrations
route[REGISTRAR] {
	if (is_method("REGISTER"))
	{
#		if(isflagset(FLT_NATS))
#		{
#			setbflag(FLB_NATB);
#			# uncomment next line to do SIP NAT pinging 
#			xlog("L_NOTICE","--------------------- SIP NAT PINGING --------------------------------------\n");
#			setbflag(FLB_NATSIPPING);
#		}
#		if (!save("location"))
#			sl_reply_error();
#			xlog("L_NOTICE","--------------------- SL REPLY ERROR --------------------------------------\n");

			if( t_check_trans() )
				{
				xlog("L_NOTICE","Transaction already exist, forwarding\n");
				}
			else
				{
				xlog("L_NOTICE","New transaction upcoming, creating\n");

#				forward("50.0.0.10");
#				save("sip:50.0.0.10","0x02");
				t_relay_to_udp("50.0.0.10", "5060");
				exit;
			}
		exit;
	}
}

route[RELAY] {
	# enable additional event routes for forwarded requests
	# - serial forking, RTP relaying handling, a.s.o.
	xlog("L_NOTICE","Default routing block raised!\n");
	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;
}

# RTPProxy control
route[NATMANAGE] {
	if (is_request()) {
		if(has_totag()) {
			if(check_route_param("nat=yes")) {
			xlog("L_NOTICE","------------------------------------ SETBFLAG ----------------------------\n");
				setbflag(FLB_NATB);
			}
		}
	}
	if (!(isflagset(FLT_NATS) || isbflagset(FLB_NATB)))
		return;

	rtpproxy_manage();

	if (is_request()) {
		if (!has_totag()) {
			if(t_is_branch_route()) {
			xlog("L_NOTICE","------------------------------------ ADD RR PARAM NAT YES ----------------------------\n");
				add_rr_param(";nat=yes");
			}
		}
	}
	if (is_reply()) {
		if(isbflagset(FLB_NATB)) {
			if(is_first_hop())
				xlog("L_NOTICE","------------------------------------ IS FIRST HOP SRT CONACT ALIAS  ----------------------------\n");
				set_contact_alias();
		}

	xlog("L_NOTICE","$rm from $fu (IP:$si:$sp) in route[NATMANAGE] RTPproxy with EI Flags\n");

	}
	return;
}

# URI update for dialog requests
route[DLGURI] {
	if(!isdsturiset()) {
		handle_ruri_alias();

	xlog("L_NOTICE","$rm from $fu (IP:$si:$sp) in route[DLGURI] RTPproxy with EI Flags\n");

	}
	return;
}

# manage outgoing branches
branch_route[MANAGE_BRANCH] {
	xlog("L_NOTICE","$rm from $fu (IP:$si:$sp) in MANAGE_BRANCH\n");
	xdbg("new branch [$T_branch_idx] to $ru\n");
	route(NATMANAGE);
}

# manage incoming replies
onreply_route[MANAGE_REPLY] {
	xlog("L_NOTICE","$rm from $fu (IP:$si:$sp) in MANAGE_REPLY\n");
	xdbg("incoming reply\n");
	if(status=~"[12][0-9][0-9]")
		route(NATMANAGE);
}

# manage failure routing cases
failure_route[MANAGE_FAILURE] {
	xlog("L_NOTICE","$rm from $fu (IP:$si:$sp) in MANAGE_FAILURE\n");
	route(NATMANAGE);

	if (t_is_canceled()) {
		exit;
	}
}

route[DEBUG] {
        if (method==("PUBLISH|SUBSCRIBE|REGISTER|OPTIONS")) {
                return;
        }
        xlog("[$mi] Received SIP Message (method: $rm) ($ml bytes) to $Ri:$Rp from $si:$sp:\n$mb\n");
}