[Serusers] PSTN

Kapil Dhawan sersavvy at hotmail.com
Tue Jun 1 10:22:22 CEST 2004


Hi List

I am still unable to solve this issue why the my NAT user is unable to hear 
when he makes a PSTn call..

# ----------- global configuration parameters ------------------------

debug=8         # debug level (cmd line: -dddddddddd)
fork=yes
log_stderror=yes	# (cmd line: -E)

check_via=no	# (cmd. line: -v)
dns=no           # (cmd. line: -r)
rev_dns=no      # (cmd. line: -R)
port=5060
children=4
fifo="/tmp/ser_fifo"

# ------------------ module loading ----------------------------------

# Uncomment this if you want to use SQL database
loadmodule "/usr/local/lib/ser/modules/mysql.so"

loadmodule "/usr/local/lib/ser/modules/sl.so"
loadmodule "/usr/local/lib/ser/modules/tm.so"
loadmodule "/usr/local/lib/ser/modules/rr.so"
loadmodule "/usr/local/lib/ser/modules/maxfwd.so"
loadmodule "/usr/local/lib/ser/modules/usrloc.so"
loadmodule "/usr/local/lib/ser/modules/registrar.so"
loadmodule "/usr/local/lib/ser/modules/textops.so"

# Uncomment this if you want digest authentication
# mysql.so must be loaded !
loadmodule "/usr/local/lib/ser/modules/auth.so"
loadmodule "/usr/local/lib/ser/modules/auth_db.so"

# !! Nathelper
loadmodule "/usr/local/lib/ser/modules/nathelper.so"

# !! Accounting
loadmodule "/usr/local/lib/ser/modules/acc.so"

# ----------------- setting module-specific parameters ---------------

# -- usrloc params --

#modparam("usrloc", "db_mode",   0)

# Uncomment this if you want to use SQL database
# for persistent storage and comment the previous line
modparam("usrloc", "db_mode", 2)

# -- auth params --
# Uncomment if you are using auth module
#
modparam("auth_db", "calculate_ha1", yes)
#
# If you set "calculate_ha1" parameter to yes (which true in this config),
# uncomment also the following parameter)
#
modparam("auth_db", "password_column", "password")

# -- rr params --
# add value to ;lr param to make some broken UAs happy
modparam("rr", "enable_full_lr", 1)

# !! Nathelper
# -- nathelper params --
modparam("registrar", "nat_flag", 6)
modparam("nathelper", "natping_interval", 30) # Ping interval 30 s
modparam("nathelper", "ping_nated_only", 1)   # Ping only clients behind NAT

# !! Accounting
# -- acc params --
# set the reporting log level
modparam("acc", "log_level", 2)   # Set log_level to 2
# number of flag, which will be used for accounting; if a message is
# labeled with this flag, its completion status will be reported
modparam("acc", "log_flag", 1 )
modparam("acc", "log_missed_flag", 2)
modparam("acc", "failed_transactions", 1)
modparam("acc", "report_cancels", 1)
modparam("acc", "db_url", "mysql://ser:heslo@localhost/ser")
modparam("acc", "db_flag", 1)
modparam("acc", "db_missed_flag", 2)

# -------------------------  request routing logic -------------------

# main routing logic

route{

	# initial sanity checks -- messages with
	# max_forwards==0, or excessively long requests
	if (!mf_process_maxfwd_header("10")) {
		sl_send_reply("483","Too Many Hops");
		break;
	};
	if (msg:len >=  max_len ) {
		sl_send_reply("513", "Message too big");
		break;
	};

        # !! Nathelper
	# Special handling for NATed clients; first, NAT test is
	# executed: it looks for via!=received and RFC1918 addresses
	# in Contact (may fail if line-folding is used); also,
	# the received test should, if completed, should check all
	# vias for rpesence of received
	if (nat_uac_test("3")) {
		# Allow RR-ed requests, as these may indicate that
		# a NAT-enabled proxy takes care of it; unless it is
		# a REGISTER

		if (method == "REGISTER" || ! search("^Record-Route:")) {
		    log("LOG: Someone trying to register from private IP, rewriting\n");

		    # This will work only for user agents that support symmetric
		    # communication. We tested quite many of them and majority is
		    # smart enough to be symmetric. In some phones it takes a 
configuration
		    # option. With Cisco 7960, it is called NAT_Enable=Yes, with kphone it 
is
		    # called "symmetric media" and "symmetric signalling".

		    fix_nated_contact(); # Rewrite contact with source IP of signalling
		    if (method == "INVITE") {
		        fix_nated_sdp("1"); # Add direction=active to SDP
		    };
		    force_rport(); # Add rport parameter to topmost Via
		    setflag(6);    # Mark as NATed
		};
	};

        # labeled all transaction for accounting
        setflag(1);
        setflag(2);

	# we record-route all messages -- to make sure that
	# subsequent messages will go through our proxy; that's
	# particularly good if upstream and downstream entities
	# use different transport protocol
	if (!method=="REGISTER") record_route();

	# subsequent messages withing a dialog should take the
	# path determined by record-routing
	if (loose_route()) {
		# mark routing logic in request
		append_hf("P-hint: rr-enforced\r\n");
		route(1);
		break;
	};

	if (!uri==myself) {
		# mark routing logic in request
		append_hf("P-hint: outbound\r\n");
		route(1);
		break;
	};

	# if the request is for other domain use UsrLoc
	# (in case, it does not work, use the following command
	# with proper names and addresses in it)
	if (uri==myself) {

		if (method=="REGISTER") {

# Uncomment this if you want to use digest authentication
			if (!www_authorize("1.1.1.1","subscriber")) {
				www_challenge("1.1.1.1", "0");
				break;
			};

			save("location");
			break;
		};

		if(uri=~"^sip:00*"){
                        append_hf("P-hint: PSTN call\r\n");
			route(1);
			break;
		};

		lookup("aliases");
		if (!uri==myself) {
			append_hf("P-hint: outbound alias\r\n");
			route(1);
			break;
		};

		# native SIP destinations are handled using our USRLOC DB
		if (!lookup("location")) {
			sl_send_reply("404", "Not Found");
			break;
		};
	};
	append_hf("P-hint: usrloc applied\r\n");
	route(1);
}

route[1]
{
	# !! Nathelper
	if (uri=~"[@:](192\.168\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)" && 
!search("^Route:")){
	    sl_send_reply("479", "We don't forward to private IP addresses");
	    break;
        };

	# if client or server know to be behind a NAT, enable relay
	if (isflagset(6)) {
	    force_rtp_proxy();
	};

	if(uri=~"^sip:00*"){
                rewritehost("2.2.2.2");
                t_relay_to_udp("2.2.2.2","5060");
                break;
	};

	# NAT processing of replies; apply to all transactions (for example,
	# re-INVITEs from public to private UA are hard to identify as
	# NATed at the moment of request processing); look at replies
	t_on_reply("1");

	# send it out now; use stateful forwarding as it works reliably
	# even for UDP2TCP
	if (!t_relay()) {
		sl_reply_error();
	};
}

# !! Nathelper
onreply_route[1] {
    # NATed transaction ?
    if (isflagset(6) && status =~ "(183)|2[0-9][0-9]") {
        fix_nated_contact();
	force_rtp_proxy();
    # otherwise, is it a transaction behind a NAT and we did not
    # know at time of request processing ? (RFC1918 contacts)
    } else if (nat_uac_test("1")) {
        fix_nated_contact();
    };
}







>From: "Kapil Dhawan" <sersavvy at hotmail.com>
>To: sersavvy at hotmail.com
>CC: serusers at lists.iptel.org
>Subject: RE: [Serusers] PSTN
>Date: Tue, 01 Jun 2004 05:02:54 +0000
>
>Hi my second part is done...i have used t_relay_to_udp rather than forward 
>for pstn calls and now logs are coming....for pstn as well
>
>but first is till not done.
>
> >From: "Kapil Dhawan" <sersavvy at hotmail.com>
> >To: serusers at lists.iptel.org
> >Subject: [Serusers] PSTN
> >Date: Tue, 01 Jun 2004 00:59:07 +0000
> >
> >Hi List
> >
> >I am running rtpproxy and nathelper which is fine for me...but when i 
>transfer all calls starting with 00 to my SIP gateway...then person calling 
>from public IP is able to hear properly the pstn call and person calling 
>behind NAT can not hear but the pstn callee can hear that behind NAT guy...
> >
> >and second is i am storing logs in acc table...there is i make a SIP-SIP 
>call, i get proper logs but if i make PSTN call whether from public or 
>private IP, i only get BYE record..
> >
> >below is my ser.cfg
> >
> >
> >#
> ># $Id: nathelper.cfg,v 1.1.2.1 2003/11/24 14:47:18 janakj Exp $
> >#
> ># simple quick-start config script including nathelper support
> >
> ># This default script includes nathelper support. To make it work
> ># you will also have to install Maxim's RTP proxy. The proxy is enforced
> ># if one of the parties is behind a NAT.
> >#
> ># If you have an endpoing in the public internet which is known to
> ># support symmetric RTP (Cisco PSTN gateway or voicemail, for example),
> ># then you don't have to force RTP proxy. If you don't want to enforce
> ># RTP proxy for some destinations than simply use t_relay() instead of
> ># route(1)
> >#
> ># Sections marked with !! Nathelper contain modifications for nathelper
> >#
> ># NOTE !! This config is EXPERIMENTAL !
> >#
> ># ----------- global configuration parameters ------------------------
> >
> >debug=8         # debug level (cmd line: -dddddddddd)
> >fork=yes
> >log_stderror=yes	# (cmd line: -E)
> >
> >/* Uncomment these lines to enter debugging mode
> >fork=no
> >log_stderror=yes
> >*/
> >
> >check_via=no	# (cmd. line: -v)
> >dns=no           # (cmd. line: -r)
> >rev_dns=no      # (cmd. line: -R)
> >port=5060
> >children=4
> >fifo="/tmp/ser_fifo"
> >
> ># ------------------ module loading ----------------------------------
> >
> ># Uncomment this if you want to use SQL database
> >loadmodule "/usr/local/lib/ser/modules/mysql.so"
> >
> >loadmodule "/usr/local/lib/ser/modules/sl.so"
> >loadmodule "/usr/local/lib/ser/modules/tm.so"
> >loadmodule "/usr/local/lib/ser/modules/rr.so"
> >loadmodule "/usr/local/lib/ser/modules/maxfwd.so"
> >loadmodule "/usr/local/lib/ser/modules/usrloc.so"
> >loadmodule "/usr/local/lib/ser/modules/registrar.so"
> >loadmodule "/usr/local/lib/ser/modules/textops.so"
> >
> ># Uncomment this if you want digest authentication
> ># mysql.so must be loaded !
> >loadmodule "/usr/local/lib/ser/modules/auth.so"
> >loadmodule "/usr/local/lib/ser/modules/auth_db.so"
> >
> ># !! Nathelper
> >loadmodule "/usr/local/lib/ser/modules/nathelper.so"
> >
> ># !! Accounting
> >loadmodule "/usr/local/lib/ser/modules/acc.so"
> >
> ># !! Voicemail And Conference
> >loadmodule "/usr/local/lib/ser/modules/vm.so"
> >
> ># ----------------- setting module-specific parameters ---------------
> >
> ># -- usrloc params --
> >
> >#modparam("usrloc", "db_mode",   0)
> >
> ># Uncomment this if you want to use SQL database
> ># for persistent storage and comment the previous line
> >modparam("usrloc", "db_mode", 2)
> >
> ># -- auth params --
> ># Uncomment if you are using auth module
> >#
> >modparam("auth_db", "calculate_ha1", yes)
> >#
> ># If you set "calculate_ha1" parameter to yes (which true in this 
>config),
> ># uncomment also the following parameter)
> >#
> >modparam("auth_db", "password_column", "password")
> >
> ># -- rr params --
> ># add value to ;lr param to make some broken UAs happy
> >modparam("rr", "enable_full_lr", 1)
> >
> ># !! Nathelper
> ># -- nathelper params --
> >modparam("registrar", "nat_flag", 6)
> >modparam("nathelper", "natping_interval", 30) # Ping interval 30 s
> >modparam("nathelper", "ping_nated_only", 1)   # Ping only clients behind 
>NAT
> >
> ># !! Accounting
> ># -- acc params --
> ># set the reporting log level
> >modparam("acc", "log_level", 2)   # Set log_level to 2
> ># number of flag, which will be used for accounting; if a message is
> ># labeled with this flag, its completion status will be reported
> >modparam("acc", "log_flag", 1 )
> >modparam("acc", "log_missed_flag", 2)
> >modparam("acc", "failed_transactions", 1)
> >modparam("acc", "report_cancels", 1)
> >modparam("acc", "db_url", "mysql://ser:heslo@localhost/ser")
> >modparam("acc", "db_flag", 1)
> >modparam("acc", "db_missed_flag", 2)
> >
> ># !! Transaction
> ># -- tm params --
> >modparam("tm", "fr_inv_timer", 200)
> >
> ># -------------------------  request routing logic -------------------
> >
> ># main routing logic
> >
> >route{
> >
> >	# initial sanity checks -- messages with
> >	# max_forwards==0, or excessively long requests
> >	if (!mf_process_maxfwd_header("10")) {
> >		sl_send_reply("483","Too Many Hops");
> >		break;
> >	};
> >	if (msg:len >=  max_len ) {
> >		sl_send_reply("513", "Message too big");
> >		break;
> >	};
> >
> >        # !! Nathelper
> >	# Special handling for NATed clients; first, NAT test is
> >	# executed: it looks for via!=received and RFC1918 addresses
> >	# in Contact (may fail if line-folding is used); also,
> >	# the received test should, if completed, should check all
> >	# vias for rpesence of received
> >	if (nat_uac_test("3")) {
> >		# Allow RR-ed requests, as these may indicate that
> >		# a NAT-enabled proxy takes care of it; unless it is
> >		# a REGISTER
> >
> >		if (method == "REGISTER" || ! search("^Record-Route:")) {
> >		    log("LOG: Someone trying to register from private IP, 
>rewriting\n");
> >
> >		    # This will work only for user agents that support symmetric
> >		    # communication. We tested quite many of them and majority is
> >		    # smart enough to be symmetric. In some phones it takes a 
>configuration
> >		    # option. With Cisco 7960, it is called NAT_Enable=Yes, with kphone 
>it is
> >		    # called "symmetric media" and "symmetric signalling".
> >
> >		    fix_nated_contact(); # Rewrite contact with source IP of signalling
> >		    if (method == "INVITE") {
> >		        fix_nated_sdp("1"); # Add direction=active to SDP
> >		    };
> >		    force_rport(); # Add rport parameter to topmost Via
> >		    setflag(6);    # Mark as NATed
> >		};
> >	};
> >
> >        # labeled all transaction for accounting
> >        setflag(1);
> >        setflag(2);
> >
> >	# we record-route all messages -- to make sure that
> >	# subsequent messages will go through our proxy; that's
> >	# particularly good if upstream and downstream entities
> >	# use different transport protocol
> >	if (!method=="REGISTER") record_route();
> >
> >	# subsequent messages withing a dialog should take the
> >	# path determined by record-routing
> >	if (loose_route()) {
> >		# mark routing logic in request
> >		append_hf("P-hint: rr-enforced\r\n");
> >		route(1);
> >		break;
> >	};
> >
> >	if (!uri==myself) {
> >		# mark routing logic in request
> >		append_hf("P-hint: outbound\r\n");
> >		route(1);
> >		break;
> >	};
> >
> >	# if the request is for other domain use UsrLoc
> >	# (in case, it does not work, use the following command
> >	# with proper names and addresses in it)
> >	if (uri==myself) {
> >
> >		if (method=="REGISTER") {
> >
> ># Uncomment this if you want to use digest authentication
> >			if (!www_authorize("220.226.42.185","subscriber")) {
> >				www_challenge("220.226.42.185", "0");
> >				break;
> >			};
> >
> >			save("location");
> >			break;
> >		};
> >
> >		lookup("aliases");
> >		if (!uri==myself) {
> >			append_hf("P-hint: outbound alias\r\n");
> >			route(1);
> >			break;
> >		};
> >
> >		# native SIP destinations are handled using our USRLOC DB
> >		if (!lookup("location")) {
> >			sl_send_reply("404", "Not Found");
> >			break;
> >		};
> >	};
> >	append_hf("P-hint: usrloc applied\r\n");
> >	route(1);
> >}
> >
> >route[1]
> >{
> >	# !! Nathelper
> >	if (uri=~"[@:](192\.168\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)" && 
>!search("^Route:")){
> >	    sl_send_reply("479", "We don't forward to private IP addresses");
> >	    break;
> >        };
> >
> >	# if client or server know to be behind a NAT, enable relay
> >	if (isflagset(6)) {
> >	    force_rtp_proxy();
> >	};
> >
> >	# NAT processing of replies; apply to all transactions (for example,
> >	# re-INVITEs from public to private UA are hard to identify as
> >	# NATed at the moment of request processing); look at replies
> >	t_on_reply("1");
> >
> >	if(uri=~"^sip:00*")
> >	{
> >		rewritehost();
> >		forward()
> >		break;
> >	};
> >
> >	# send it out now; use stateful forwarding as it works reliably
> >	# even for UDP2TCP
> >	if (!t_relay()) {
> >		sl_reply_error();
> >	};
> >}
> >
> ># !! Nathelper
> >onreply_route[1] {
> >    # NATed transaction ?
> >    if (isflagset(6) && status =~ "(183)|2[0-9][0-9]") {
> >        fix_nated_contact();
> >	force_rtp_proxy();
> >    # otherwise, is it a transaction behind a NAT and we did not
> >    # know at time of request processing ? (RFC1918 contacts)
> >    } else if (nat_uac_test("1")) {
> >        fix_nated_contact();
> >    };
> >}
> >
> >_________________________________________________________________
> >Post Classifieds on MSN classifieds. http://go.msnserver.com/IN/44045.asp 
>Buy and Sell on MSN Classifieds.
> >
> >_______________________________________________
> >Serusers mailing list
> >serusers at lists.iptel.org
> >http://lists.iptel.org/mailman/listinfo/serusers
>

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