#
# $Id: ser-isdngw.conf,v 1.2 2003/09/09 17:48:22 ullstar Exp $
#

debug=1		        # debug level (cmd line: -dddddddddd)
fork=yes

log_stderror=no # (cmd line: -E)
check_via=yes		# (cmd. line: -v)
dns=0			# (cmd. line: -r)
rev_dns=0		# (cmd. line: -R)
port=5060
listen=192.168.0.1
alias=mydomain.com
children=8
fifo="/tmp/ser2_fifo"

# Add the name of your system here
#listen=yourhostname
# for more names add alias entries, all that might be used as domain in SIP URI
#alias=yourhostname.yourdomain.com
#alias=your.ip.addr.ess


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

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/maxfwd.so"
loadmodule "/usr/local/lib/ser/modules/vm.so"
	

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

# You may want to define things like databases here. Please refer to 
# the extensive SER documentation for this purpose. Module parameters 
# are always described in the modules README files.
#
# For pure isdn gateway functionality only a database is needed, we use
# a simple textfile for this purpose. Actually this is only neccessary until
# the vm module is reworked. Simply copy the etc/db directory from the isdngw
# directory somewhere and specify it in the following statement:

modparam("voicemail", "db_url","sql://ser:heslo@localhost/ser")


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

# This section describes how SIP messages are handled. 

route{

	# initial sanity checks -- messages with
	# max_forwars==0, or excessively long requests
	if (!mf_process_maxfwd_header("20")) {
		sl_send_reply("483","Too Many Hops");
		break;
	};

        if (msg:len >= 2960) {  # messages > 2 * max. sized eth. datagrams
                sl_send_reply("513", "Message too large");
	        break;
        };

	if (src_ip != 192.168.0.2) {
		# Drop request that are not coming from the main proxy
		sl_send_reply("403", "Forbidden");
		break;
	};
					       
	# deal with my domain first
	if (uri == myself) {
		# ############################## #
		# isdngw specific configuration  #
		# ############################## #
		if (t_newtran()) {
			if (method == "INVITE" || method == "BYE" || method == "CANCEL"){

				# send a response right at the start to avoid retransmissions
				t_reply("100","Trying -- just wait a minute !");

				# isdngw only gets activated on invite requests
				if (method == "INVITE") {
				
					# Usernames begining with vm+ are destined to voicemail
					if (uri =~ "^[a-zA-Z]+:vm\+.*") {
						# remove the vm+ prefix
						strip(3);
						if (!vm("/tmp/am_fifo", "voicemail")) {
							log("Could not contact voicemail\n");
							t_reply("500", "Could not contact voicemail");
						};
					} else if (uri =~ "^[a-zA-Z]+:[0-9]+@.*") {

					# isdngw feels to be responsible for numeric userparts
					# all numbers followed by @ and anything after it match
					# this expression
					# for example: sip:555123123@yourdomain.com:5061 matches.
					# The vm command (from module vm) is used to contact the 
					# media server and though it the isdngw.
					# /tmp/am_fifo is the fifo filename ued for communications, make
					# shure the permissions are correct and that the same fifo
					# filename is defined in sems.conf.
						if (!vm("/tmp/am_fifo", "isdngw")) {
							log("could not contact isdngw\n");
							t_reply("500","could not contact isdngw");
						};
					# we dont feel responsible for sip addresses not starting with
					# a number, so send the right error code.
					} else {
						if (!vm("/tmp/am_fifo", "announcement")) {
							log("could not contact announcement\n");
							t_reply("500", "could not contact announcement");
						};
					};
					# stop routing here, the message is now processed by the media server
					break;
				};

				# The following handles the call termination, we must pass these requests
				# to the media server as follows. Again make shure the fifo name and permissions
				# are set correctly (like im sems.conf).
				if ((method == "BYE") || (method == "CANCEL")) {
						if (!vm("/tmp/am_fifo","bye")) {
							log("could not contact the media server\n");
							t_reply("500","could not contact the media server");
						};
						break;
				};
			# other methods than INVITE, BYE and CANCEL are not handled by this SIP Server
			# so we sent an error message
			} else {
				log("ERROR: method not supported\n");
				t_reply("500", "Sorry, method not supported");
			};	
		} else {
			# for any reason the transaction could not be created, send error code
			log("could not create new transaction\n");
			sl_send_reply("500","Could not create new transaction");
		};
	# not uri=myself, this SIP request is not directed to us, simply direct it to its
	# correct destination
	} else {
	    sl_send_reply("403", "No relaying");
	    break;
	};
# end of routing.
}