kamailio.cfg

#!KAMAILIO

################################################################
#
#  This is a front-end SIP proxy configuration for the xlab1 project
#  See for more details: https://txlab.wordpress.com/tag/xlab1/
#  The configuration requires Kamailio version 3.3.x
#
#  This work is licensed under a Creative Commons Attribution 3.0 License
#  Author: Stanislav Sinyagin <ssinaygin@k-open.com>
#
################################################################



#!define WITH_DEBUG

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

#!define DBURL "text:///opt/sipfe/etc/kamailio_db"

#!define BACKEND_NET4 10.100.0.0/24
#!define BACKEND_NET6 2a02:200:8:100::/64

####### Global Parameters #########

#!ifdef WITH_DEBUG
debug=4
log_stderror=no
#!else
debug=2
log_stderror=no
#!endif

memdbg=5
memlog=5

log_facility=LOG_LOCAL0

fork=yes
children=2

auto_aliases=no

# to avoid simple attacks, use unconventional port
port=5066

# this makes it listen on all ipv6 addresses
auto_bind_ipv6=1


dns_try_ipv6=yes

# let kamailio choose the right source IP address
mhomed=1

# life time of TCP connection when there is no traffic
# - a bit higher than registration expires to cope with UA behind NAT
tcp_connection_lifetime=3605


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

mpath="/opt/sipfe/lib64/kamailio/modules_k/:/opt/sipfe/lib64/kamailio/modules/"

loadmodule "db_text.so"

loadmodule "mi_fifo.so"
loadmodule "kex.so"
loadmodule "sl.so"
loadmodule "rr.so"
loadmodule "pv.so"
loadmodule "maxfwd.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 "path.so"
loadmodule "domain.so"
loadmodule "dispatcher.so"
loadmodule "nathelper.so"
loadmodule "rtpproxy.so"


#!ifdef WITH_DEBUG
loadmodule "debugger.so"
#!endif

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


modparam("mi_fifo", "fifo_name", "/tmp/kamailio_fifo")


# 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", 0)

modparam("nathelper", "received_avp", "$avp(RECEIVED)")
modparam("nathelper", "nortpproxy_str", "a=sdpmangled:yes\r\n")

modparam("path", "use_received", 1)

modparam("domain", "db_url", DBURL)

modparam("dispatcher", "db_url", DBURL)

modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:22222")


#!ifdef WITH_DEBUG
# ----- debugger params -----
modparam("debugger", "cfgtrace", 1)
#!endif

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


route {
    if (!sanity_check()) {
        exit;
    }

    if ( !mf_process_maxfwd_header("10") )
    {
        sl_send_reply("483","To Many Hops");
        xlog("L_NOTICE", "$si $rm $ru -- too many hops\n");
        exit;
    }

    if (af==INET)
    {
        force_rport();

        if (src_ip != BACKEND_NET4)
        {
            # SIP request packet client->backend

            if( !loose_route() )
            {
                if (!lookup_domain("$td", "dattr_")) {
                    xlog("L_ERR", "$si $rm $ru -- domain \"$td\" is not " +
                        "found in domain table\n");
                    drop();
                }

                if (!defined $avp(dattr_routeset))
                {
                    xlog("L_ERR",
                        "$si $rm $ru -- attribute \"routeset\" is " +
                        "undefined for domain $td\n");
                    drop();
                }

                if( !ds_select_dst(4000 + $avp(dattr_routeset), "1") )
                {
                    drop();
                }
            }

            if (nat_uac_test("19")) {
                if (method=="REGISTER") {
                    fix_nated_register();
                } else {
                    fix_nated_contact();
                }
            }


            add_path_received();
            rtpproxy_manage("cwei");
            record_route();
        }
        else
        {
            # SIP request packet backend->client

            # Invites from backend contain Route field and it should be used
            # to reach the registered client
            loose_route();
            rtpproxy_manage("cwie");
            record_route();
        }
    }
    else
    {
        # IPv6: no NAT traversal, just pure routing

        if (src_ip != BACKEND_NET6)
        {
            # SIP request packet client->backend

            if( !loose_route() )
            {
                if (!lookup_domain("$td", "dattr_")) {
                    xlog("L_ERR", "$si $rm $ru -- domain \"$td\" is not " +
                        "found in domain table\n");
                    drop();
                }

                if (!defined $avp(dattr_routeset))
                {
                    xlog("L_ERR",
                        "$si $rm $ru -- attribute \"routeset\" is " +
                        "undefined for domain $td\n");
                    drop();
                }

                if( !ds_select_dst(6000 + $avp(dattr_routeset), "1") )
                {
                    drop();
                }
            }

            add_path_received();
            record_route();
        }
        else
        {
            # SIP request packet backend->client

            record_route();
        }
    }

    forward();
}


onreply_route {

    if (af==INET)
    {
        if(src_ip != BACKEND_NET4)
        {
            # SIP reply packet client->backend

            rtpproxy_manage("cwie");
            fix_nated_contact();
        }
        else
        {
            # SIP reply packet backend->client

            rtpproxy_manage("cwei");
        }
    }

    return(1);
}



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