Testing the Kamailio Outbound Module

Hi, team

# Testing the Kamailio Outbound Module

Kamailio version: 6.0.5

OS: Debian 12

Kamailio IP: 192.168.149.18, Port: 5060

FreeSWITCH (REGISTRAR) IP: 192.168.149.18, Port: 6666

MicroSIP IP: 192.168.149.35, transport protocol: TCP

## Signaling Flows
MicroSIP => REGISTER => Kamailio => FreeSWITCH, this is OK
MicroSIP => INVITE => Kamailio => FreeSWITCH, this is OK also

However, executing `fs_cli -x 'show registrations as xml'` on FreeSWITCH returns the following:

```xml
<result row_count="1">
  <row row_id="1">
    <reg_user>1001</reg_user>
    <realm>192.168.149.18</realm>
    <token>992b228842f841fda057da1883e5317a</token>
    <url>sofia/internal/sip:[email protected]:49676;transport=TCP;ob;fs_path=%3Csip%3A192.168.149.18%3Blr%3E</url>
    <expires>1769678856</expires>
    <network_ip>192.168.149.18</network_ip>
    <network_port>5060</network_port>
    <network_proto>tcp</network_proto>
    <hostname>debian</hostname>
    <metadata></metadata>
  </row>
</result>
```

Command executed:
`fs_cli -x 'originate user/1001 &park'`

The INVITE message is as follows:

```
INVITE sip:[email protected]:59527;transport=TCP;ob SIP/2.0
Via: SIP/2.0/UDP 192.168.149.18:6666;rport;branch=z9hG4bK0mU9ryZD57S0p
Route: <sip:192.168.149.18;lr>
Max-Forwards: 70
From: <sip:[email protected]>;tag=97mDae4gQHXFa
To: <sip:[email protected]:59527;transport=TCP;ob>
Call-ID: a59d2625-7790-123f-979c-0800279269e8
CSeq: 110284145 INVITE
Contact: <sip:[email protected]:6666>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
Supported: outbound, path, replaces
Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 764
X-FS-Support: update_display,send_info
Remote-Party-ID: <sip:[email protected]>;party=calling;screen=yes;privacy=off
```
...

However, the log shows "client to registrar" instead of "registrar to client".

What is the reason for this?

The contents of kamailio.cfg are as follows:

```
#!KAMAILIO
#
# Edge proxy configuration
#

listen=tcp:192.168.149.18:5060
listen=udp:192.168.149.18:5060

#!subst "/REGISTRAR_IP/192.168.149.18/"
#!subst "/REGISTRAR_PORT/6666/"
#!substdef "/FLOW_TIMER/20/"

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

auto_aliases=no

debug=2
log_stderror=no
log_facility=LOG_LOCAL0
log_prefix="{$mt $hdr(CSeq) $ci} "
fork=yes
children=4
alias="example.com"
#mpath="/usr/lib64/kamailio/modules"
tcp_connection_lifetime=30 # FLOW_TIMER + 10
force_rport=yes

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

loadmodule "tm.so"
loadmodule "sl.so"
loadmodule "outbound.so"
loadmodule "rr.so"
loadmodule "path.so"
loadmodule "pv.so"
loadmodule "maxfwd.so"
loadmodule "xlog.so"
loadmodule "sanity.so"
loadmodule "ctl.so"
loadmodule "textops.so"
loadmodule "siputils.so"
loadmodule "stun.so"

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

# ----- tm params -----
modparam("tm", "failure_reply_mode", 3)

# ----- rr params -----
modparam("rr", "append_fromtag", 0)

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

request_route {
	route(REQINIT);

	if (is_method("CANCEL")) {
		if (t_check_trans()) {
			route(RELAY);
		}
		exit;
	}

	route(WITHINDLG);

	t_check_trans();

	if (is_method("REGISTER")) {
		remove_hf("Route");
		add_path();
		$du = "sip:REGISTRAR_IP:REGISTRAR_PORT";
	} else {
		if (is_method("INVITE|SUBSCRIBE"))
			record_route();

		if (@via[2] == "") {
			# From client so route to registrar...
			xinfo("client to registrar\n");
			if ($rU == $null) {
				sl_send_reply("484", "Address Incomplete");
				exit;
			}
			remove_hf("Route");
			$du = "sip:REGISTRAR_IP:REGISTRAR_PORT";
		} else {
			# From registrar so route using "Route:" headers...
			xinfo("registrar to client\n");
			if (!loose_route()) {
				switch($rc) {
				case -2:
					sl_send_reply("403", "Forbidden");
					exit;
				default:
					xlog("L_ERR", "in request_route\n");
					sl_reply_error();
					exit;
				}
			}

			t_on_failure("FAIL_OUTBOUND");
		}
	}

	route(RELAY);
}

route[RELAY] {
	if (!t_relay()) {
		sl_reply_error();
	}
	exit;
}

route[REQINIT] {
	if (!mf_process_maxfwd_header("10")) {
		sl_send_reply("483","Too Many Hops");
		exit;
	}

	if(!sanity_check("1511", "7"))
	{
		xlog("Malformed SIP message from $si:$sp\n");
		exit;
	}
}

route[WITHINDLG] {
	if (has_totag()) {
		if (!loose_route()) {
			switch($rc) {
			case -2:
				sl_send_reply("403", "Forbidden");
				exit;
			default:
				if (is_method("ACK")) {
					if ( t_check_trans() ) {
						route(RELAY);
						exit;
					} else {
						exit;
					}
				}
				sl_send_reply("404","Not Found");
			}
		} else {
			if (is_method("NOTIFY")) {
				record_route();
			}
			route(RELAY);
		}
		exit;
	}
}

onreply_route {
	if (!t_check_trans()) {
		drop;
	}

	if ($rm == "REGISTER" && $rs >= 200 && $rs <= 299) {
		remove_hf("Flow-Timer");
		if ($(hdr(Require)[*])=~"outbound")
			insert_hf("Flow-Timer: FLOW_TIMER\r\n", "Call-ID");
	}
}

failure_route[FAIL_OUTBOUND] {
	if (t_branch_timeout() && !t_branch_replied()) {
		send_reply("430", "Flow Failed");
	}
}
```
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