Kamailio basic setup as proxy for FreeSWITCH

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Below is two example sample configurations of Kamailio as a SIP proxy to FreeSWITCH.

Simple Setup

192.168.0.101 is the IP of Kamailio

192.168.0.102 is the IP of FreeSWITCH

memdbg=5
memlog=5

log_facility=LOG_LOCAL0

fork=yes
children=4
disable_tcp=yes
listen=udp:192.168.0.101:5060
port=5060
mpath="/usr/lib64/kamailio/modules/"

# ------------------ module loading ----------------------------------
loadmodule "mi_fifo.so"
loadmodule "tm.so"
loadmodule "sl.so"
loadmodule "rr.so"
loadmodule "pv.so"
loadmodule "maxfwd.so"
loadmodule "textops.so"
loadmodule "siputils.so"
loadmodule "xlog.so"

# ----------------- setting module-specific parameters ---------------
modparam("mi_fifo", "fifo_name", "/tmp/kamailio_fifo")

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

# main routing logic

route{

        /* ********* ROUTINE CHECKS  ********************************** */

        # filter too old messages
        if (!mf_process_maxfwd_header("10")) {
                log("LOG: Too many hops\n");
                sl_send_reply("483","Too Many Hops");
                break;
        };

        # grant Route routing if route headers present 
        if (has_totag()) {
                if (loose_route()) {
                        t_relay();
                        break;
                } else {
                        if ( is_method("ACK") ) {
                                if ( t_check_trans() ) {
                                        t_relay();
                                        break;
                                } else {
                                        exit;
                                }
                        }
                        sl_send_reply("404","Not here");
                }
                exit;
        }

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

        # Process initial INVITE
        if (method=="INVITE") {
                record_route();
        } else {
                sl_send_reply("404","Not here");
                exit;
        };

        rewritehostport("192.168.0.102:5060");

        # forward the request now
        if (!t_relay()) {
                sl_reply_error(); 
                break; 
        };
} 

Simple setup with database lookup

192.168.0.101 is the IP of Kamailio

192.168.0.102 is the IP of FreeSWITCH box 1

192.168.0.103 is the IP of FreeSWITCH box 2

 memdbg=5
memlog=5

log_facility=LOG_LOCAL0

fork=yes
children=4
disable_tcp=yes
listen=udp:192.168.0.101:5060
port=5060
mpath="/usr/lib64/kamailio/modules/"

# ------------------ module loading ----------------------------------
loadmodule "db_postgres.so"
loadmodule "mi_fifo.so"
loadmodule "tm.so"
loadmodule "sl.so"
loadmodule "rr.so"
loadmodule "pv.so"
loadmodule "maxfwd.so"
loadmodule "textops.so"
loadmodule "siputils.so"
loadmodule "xlog.so"
loadmodule "sqlops.so"

# ----------------- setting module-specific parameters ---------------
modparam("mi_fifo", "fifo_name", "/tmp/kamailio_fifo")
modparam("sqlops", "sqlcon", "ca=>postgres://kamailio:kamailio@localhost/kamailio")

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

# main routing logic

route{

        /* ********* ROUTINE CHECKS  ********************************** */

        # filter too old messages
        if (!mf_process_maxfwd_header("10")) {
                log("LOG: Too many hops\n");
                sl_send_reply("483","Too Many Hops");
                break;
        };

        # grant Route routing if route headers present 
        if (has_totag()) {
                if (loose_route()) {
                        t_relay();
                        break;
                } else {
                        if ( is_method("ACK") ) {
                                if ( t_check_trans() ) {
                                        t_relay();
                                        break;
                                } else {
                                        exit;
                                }
                        }
                        sl_send_reply("404","Not here");
                }
                exit;
        }

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

        $var(hp) = 0;
        # Process initial INVITE
        if (method=="INVITE") {
                record_route();
                # only match 10-11 digit numbers and strip '+' if it exists
                if (subst_user('/^\+?1?([0-9]{10})$/1\1/')) {
                        sql_query ("ca", "SELECT accountcode FROM numbers WHERE number = '$rU'", "ra");
                        $var(hp) = $dbr(ra=>[0,0]);
                        sql_result_free("ra");

                } else {
                        sl_send_reply("404","Not here");
                        exit;
                }
        } else {
                sl_send_reply("404","Not here");
                exit;
        };

        if ($var(hp) == 0) {
                sl_send_reply("404","Not here");
                exit;
        } else {
                switch ($var(hp)) {
                        case 1:
                                rewritehostport("192.168.0.102:5060");
                        case 2:
                                rewritehostport("192.168.0.103:5060");
                }
        }

        # forward the request now
        if (!t_relay()) {
                sl_reply_error(); 
                break; 
        };
}