kamailio.cfg

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

debug=2
log_stderror=no

memdbg=5
memlog=5

log_facility=LOG_LOCAL0

fork=yes
children=4

port=5060

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

# set paths to location of modules
mpath="/usr/local/lib64/kamailio/modules_k/:/usr/local/lib64/kamailio/modules/"

loadmodule "tm.so"
loadmodule "sl.so"
loadmodule "pv.so"
loadmodule "maxfwd.so"
loadmodule "dispatcher.so"

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

# ----- tm params -----
# auto-discard branches from previous serial forking leg
modparam("tm", "failure_reply_mode", 3)
# default retransmission timeout: 30sec
modparam("tm", "fr_timer", 30000)
# default invite retransmission timeout after 1xx: 120sec
modparam("tm", "fr_inv_timer", 120000)

# ----- dispatcher params -----
modparam("dispatcher", "list_file", "/usr/local/etc/kamailio/dispatcher.list")
modparam("dispatcher", "flags", 2)
modparam("dispatcher", "dst_avp", "$avp(AVP_DST)")
modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)")
modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)")

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

# Main SIP request routing logic
route {
	if ( !mf_process_maxfwd_header("10") )
	{
	 	sl_send_reply("483","To Many Hops");
		exit;
	}

	# select from first dst group by round-robin
	if(!ds_select_dst("1", "4"))
	{
		sl_send_reply("500", "No destination available");
		exit;
	}

	t_on_failure("RTF_DISPATCH");
	if(!t_relay())
	{
		sl_reply_error();
		exit;
	}
}

# dispatcher failure routing block
failure_route[RTF_DISPATCH] {
	if (t_is_canceled()) {
		exit;
	}
	# select next destination only for local timeout
	if (t_branch_timeout() && !t_branch_replied())
	{
		if(ds_next_dst())
		{
			t_on_failure("RTF_DISPATCH");
			t_relay();
			exit;
		}
	}
}