[Serusers] SMS gateway using a mobile phone

LeeCC, Kenny Kenny.LeeCC at hp.com
Tue Apr 1 15:53:20 CEST 2003


Hi,

Am trying to get SER to send SMS messages out via my SER server serial/comm port connected to a Motorola Timeport P7382 mobile phone but am having trouble because of SER "sms.so" module keep trying to register the SMS center number; syslog snippet. 

<snip>
Apr  1 18:32:28 gits /usr/sbin/ser[18276]: INFO:initmodem: Checking if Modem is registered to the network
Apr  1 18:32:30 gits /usr/sbin/ser[18266]: NOTICE:initmodem: Waiting 2 sec. before retrying
<snip>

The mobile phone already register to the SMS center number thus re-registering is not required. "sms.so" module doesn't seems to pick up the message that the mobile phone have already registered to the SMS center number and I have to amend and recompile "libsms_modem.c" because the mobile phone do not recognise AT+CREG command but AT+CSCA command.

To test whether the mobile phone is able to send SMS messages out via the serial/comm port, I used Stefan Frings "SMS Server Tools" by commenting the config file from registering the SMS center number and it managed to send out sms messages. However on SER "sms.so" modules, I have no idea how to stop it from registering the SMS center number. From the "../sms/README" file, it did mention that "c=SMS_center" is mandatory. That looks like not registering to the SMS center is a no-no. :-( Other than changing some words here and there of the source code via gut feel, I don't have any experience in C thus am yelping for help here.

Btw, the modem baud rate on "sms.c" only supports up to 38400 and that won't work with my mobile phone, thus have to add a line for 57600 baud rate. Maybe is already added in the latest CVS. Am using the stable version source. Below is my "ser.cfg".

Thanks & rgds,
kenny.leecc
-------------------------------------------

#
# $Id: ser.cfg,v 1.12 2002/10/21 02:40:06 jiri Exp $
#
# simple quick-start config script
#

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

debug=9          # debug level (cmd line: -dddddddddd)
fork=yes
log_stderror=no # (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/lib/ser/modules/mysql.so"

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

# Uncomment this if you want digest authentication
# mysql.so must be loaded !
loadmodule "//usr/lib/ser/modules/auth.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", "secret", "alsdkhglaksdhfkloiwr")
modparam("auth", "calculate_ha1", yes)
#
# If you set "calculate_ha1" parameter to yes (which true in this config),
# uncomment also the following parameter)
#
modparam("auth", "password_column", "password")

# -- SMS params --
modparam("sms","modems","Motorola [d=/dev/ttyS0;b=57600;m=new;l=20;r=2]")
modparam("sms","networks","Maxis[c=60120000015;m=10]")
modparam("sms","links","Motorola [Maxis]")
modparam("sms","domain","gits.msasip.net")
modparam("sms","max_sms_parts",3)
modparam("sms","use_contact",1)

# -- tm params --
modparam("tm", "fr_timer", 10 )
modparam("tm", "fr_inv_timer", 10 )
modparam("tm", "wt_timer", 10 )

# -- pike params --
# no more than minimum 5 or maximum 5*3 msg per 10 secs - only for sms
modparam("pike","sampling_time_unit",60)
modparam("pike","reqs_density_per_unit",5)
modparam("pike","removel_latency",30)

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

# main routing logic

alias="my.domain"

route{

        # initial sanity checks -- messages with
        # max_forwars==0, or excessively long requests
        # filter too old messages
        if (!mf_process_maxfwd_header("10")) {
                log("LOG: Too many hops\n");
                sl_send_reply("483","Too Many Hops");
                break;
        };

        # messages too large are denied
        if (len_gt( max_len )) {
                sl_send_reply("513", "Message too big");
                break;
        };

        # accept only req coming from my.domain
        if (!src_ip==192.168.1.1 |
        !( uri=~"my.domain" | uri=~"192\.168\.1\.0" ))
        {
                sl_send_reply("403","Forbidden");
                log("SER:Forbidden request: wrong src_ip or req_uri\n");
                break;
        };

        # we are not interested in non-MESSAGE requests
        if (!method=="MESSAGE")
        {
                sl_send_reply("501","Not Implemented");
                break;
        };

        # error occured ...
        if (! t_newtran())
        {
                sl_reply_error();
                break;
        };

        ### ------ SMS GATEWAY --------
        # let's block ips that send a lot of request!!
        if (!pike_check_req() )
        {
                break;
        };
        # SMS expects only the numbers as follows +<int> <area> <nr>
        #if (!(uri=~"sip:+[^0][0-9]{3}"))
        if (!(uri=="sip:0121234567"))
        {
                log("SER: invalid number format!!\n");
                if (!t_reply("502","Bad gateway - invalid number"))
                {
                        # if replying failed, retry statelessly
                        sl_reply_error();
                };
                break;
        };
        if (sms_send_msg_to_net("Maxis"))
        {
                # for sending replies, we won't use the statefull
                # function because it is not able to add the Contact
                # header (in fact to add any rpl_lump :-( )
                # things went well, send ok upstream
                if (!t_reply("202", "yes sir, SMS sent over"))
                {
                        # if replying failed, retry statelessly
                        sl_reply_error();
                };
        } else {
                if (!t_reply("502", "Bad gateway - SMS error"))
                {
                        # if replying failed, retry statelessly
                        sl_reply_error();
                };
                break;
        };

        # Do strict routing if pre-loaded route headers present
        rewriteFromRoute();

        # forward or handoff to PSTN
        if (uri=~"^sip:9[0-9]*@192.168.1.66") {
               strip(1);
               log("Forwarding to PSTN\n");
               rewritehostport("192.168.1.50:5060");
        };

        lookup("aliases");
        # 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("my.domain", "subscriber")) {
                                www_challenge("my.domain", "0");
                                break;
                        };


                        save("location");
                        break;
                };

                # native SIP destinations are handled using our USRLOC DB
                if (!lookup("location")) {
                        sl_send_reply("404", "Not Found");
                        break;
                };
        };

        # forward to current uri now
        if (!t_relay()) {
                sl_reply_error();
        };

}



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