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<!-- Module User's Guide -->

<chapter xmlns:xi="http://www.w3.org/2001/XInclude">
	
	<title>&adminguide;</title>
	
	<section>
	<title>Overview</title>
	<para>
		This module is a gateway between &kamailio; and a XMPP/Jabber server.
		It enables the exchange of instant messages between
		SIP clients and XMPP(jabber) clients.
	</para>
	<para>
		The module can be used in two different modes:
	</para>

	<itemizedlist>
		<listitem>
			<para>
				<emphasis role='bold'>XMPP Component Mode</emphasis>. In this mode,
				&kamailio; connects to an XMPP server using the standardized XMPP
				component interface, extending your XMPP services. The connection
				is done over TCP/IP with authorization.</para>
		</listitem>
		<listitem>
			<para>
				<emphasis role='bold'>XMPP Server</emphasis>. In this mode, the
				&kamailio; XMPP module is a stand-alone XMPP server connector, with
				no requirement for another XMPP server in the system. This server
				uses XMPP S2S (Server to Server) connections to connect to other
				XMPP servers or receive connections from other servers. NOTE: this
				is limited implementation of a XMPP server, it does not support SRV
				or TLS so far. Also, in this mode it cannot get XMPP clients
				connected, only XMPP servers (in other words, you cannot use it to
				replace an XMPP full server implementation). This mode is in beta
				stage for the moment.
			</para>
		</listitem>
	</itemizedlist>
	<para>
		In the component mode, you need a local XMPP server (recommended Jabberd2).
		The XMPP module will connect by using TCP/IP connection to the local jabber
		server. The documentation and the source for Jabberd server are located at
		the following link:
		<ulink url="http://jabberd.jabberstudio.org/2/#download">http://jabberd.jabberstudio.org/2/#download</ulink>
	</para>
	<para>
		After you have a running XMPP server, what you need to do is set the following
		parameters in the &kamailio; configuration file:
	</para>
	<itemizedlist>
		<listitem>
			<para>
				gateway_domain, xmpp_domain (which can be the same as gateway_domain)
				and xmpp_host, which are explained in the Exported Parameters section;
			</para>
		</listitem>
		<listitem>
			<para>listen = your ip;</para>
		</listitem> 
		<listitem>
			<para>alias=&kamailio; SIP domain and alias=gateway domain;</para>
		</listitem>
		<listitem>
			<para>in the following section of the configuration file, change to your gateway domain:</para>
		</listitem>	
	</itemizedlist>
	<programlisting format="linespecific"> <emphasis>	<![CDATA[ ### ---8<--- cut here ---8<--- ###
	if ($rd =="sip-xmpp.kamailio.org") {
		if (!t_newtran()) {
			sl_reply_error();
	...........]]>	</emphasis> </programlisting> 	
	<itemizedlist>
		<listitem>
			<para>
				You can also define a password for the XMPP Component connection
				to the Jabber server, which must be the same as the xmpp_password parameter.
			</para>
		</listitem>
	</itemizedlist>
	<para>
		A use case, for the component-mode, would look like this:
	</para>
	<itemizedlist>
		<listitem>
			<para>&kamailio; is hosting the sip-server.kamailio.org SIP domain</para>
		</listitem>
		<listitem>
			<para>The gateway SIP domain is sip-xmpp.kamailio.org</para>
		</listitem>	
		<listitem>
			<para>The XMPP server is hosting the XMPP domain xmpp.kamailio.org</para>
		</listitem>	
		<listitem>
			<para>The Component is hosting the XMPP domain xmpp-sip.kamailio.org</para>
		</listitem>	
	</itemizedlist>
	<para>
		In the XMPP stand-alone server mode, the XMPP module is a minimal XMPP/Jabber server.
		In this mode, another Jabber server is not needed. The gateway will connect to other
		XMPP servers basaed on the JID domain and by using the standardized XMPP S2S protocol.
	</para>
	<para>
		If you want to change to server-mode, you have to change the "backend" parameter,
		as shown in the Exported Parameters section, from "component" to "server".
	</para>
	<para>A use case, for the server-mode, would look like this: </para>
	<itemizedlist>
		<listitem>
			<para>&kamailio; is hosting the SIP domain sip-server.kamailio.org </para>
		</listitem>
		<listitem>
			<para>The gateway is hosting the SIP domain sip-xmpp.kamailio.org;</para>
		</listitem>	
		<listitem>
			<para>The "XMPP server" is running on xmpp-sip.kamailio.org.</para>
		</listitem>
	</itemizedlist>	
	<para>
		Unless 'gwmap' parameter is set, in both modes (server or component), the
		destination address must have the same pattern:
	</para>
	<para>
		<quote>sip:username<![CDATA[<]]>delim<![CDATA[>]]>jabber_server@gateway_domain</quote>
	</para>
	<para>
		From a jabber client's point of view, the destination will look like:
	</para>
	<para>
		<quote>sip_username<![CDATA[<]]>delim<![CDATA[>]]>sip_domain@xmpp_domain</quote>
	</para>
	<para>
		'delim' is a character that can be set via 'domain_separator' parameter.
	</para>
	<para>
		If 'gwmap' parameter is used, then the addresses are not enconding the domains
		in the username part. They are going to be straight 'username@domain' always.
	</para>
	</section>
	<section>
	<title>Dependencies</title>
	<section>
		<title>&kamailio; Modules</title>
		<para>
		The following modules must be loaded before this module:
			<itemizedlist>
			<listitem>
			<para>
				<emphasis>requires 'tm' module</emphasis>.
			</para>
			</listitem>
			</itemizedlist>
		</para>
	</section>
	<section>
		<title>External Libraries or Applications</title>
		<para>
		The following libraries or applications must be installed before running
		&kamailio; with this module loaded:
			<itemizedlist>
			<listitem>
			<para>
				<emphasis>expat</emphasis> - used for parsing/building XML. Linux package: libexpat1-devel
			</para>
			</listitem>
			</itemizedlist>
		</para>
	</section>
	</section>


	<section>
	<title>Parameters</title>
	<section>
		<title><varname>backend(string)</varname></title>
		<para>
		The mode you are using the module; it can be either "component" or "server".
		</para>
		<para>
		<emphasis>
			Default value is "component".
		</emphasis>
		</para>
		<example>
		<title>Set <varname>backend</varname> parameter</title>
		<programlisting format="linespecific">
...
 modparam("xmpp", "backend", "server")
...
</programlisting>
		</example>
	</section>
	<section>
		<title><varname>domain_separator</varname> (string)</title>
		<para>
			In the destination address we need an extra character as a domain separator, apart from @.
			The address of the XMPP(jabber) client looks like this:
				"sip:username<![CDATA[<]]>domain_separator<![CDATA[>]]>jabber_server@gateway_sip_domain".
			The address of a SIP client has the following pattern :
			"sip_username<![CDATA[<]]>domain_separator<![CDATA[>]]>sip_domain@gateway_xmpp_domain";
			A common used character in XMPP transports is "%".

		</para>
		<para>
		<emphasis>
			Default value is "*".
		</emphasis>
		</para>
		<example>
		<title>Set <varname>domain_separator</varname> parameter</title>
		<programlisting format="linespecific">
...
 modparam("xmpp", "domain_separator", "%")
...
</programlisting>
		</example>
	</section>
	<section>
		<title><varname>gateway_domain</varname> (string)</title>
		<para>
			The domain of the SIP-to-XMPP gateway - it has to be in DNS or SIP UA has to
			use outbound proxy to SIP-to-XMPP gateway IP address. It has to be used
			as domain in the the destination address of the messages sent by SIP users
			to XMPP users:
			"sip:username<![CDATA[<]]>delim<![CDATA[>]]>jabber_server@gateway_domain".
		</para>
		<para>
		<emphasis>
			Default value is "sip-xmpp.example.org".
		</emphasis>
	</para>
		<example>
		<title>Set <varname>gateway_domain</varname> parameter</title>
		<programlisting format="linespecific">
...
 modparam("xmpp", "gateway_domain", "sip-xmpp.kamailio.org")
...
</programlisting>
		</example>
	</section>
	<section>
		<title><varname>xmpp_domain</varname> (string)</title>
		<para>
			The XMPP domain of the component or the server, depending on the mode.
			It can be the same as the gateway_domain. For a server DNS name, you have
			to add _xmpp-server._tcp SRV records in your DNS zone to enable connections
			from other XMPP servers.
		</para>
		<para>
		<emphasis>
			Default value is "sip-xmpp.example.org".
		</emphasis>
		</para>
		<example>
		<title>Set <varname>xmpp_domain</varname> parameter</title>
		<programlisting format="linespecific">
...
 modparam("xmpp", "xmpp_domain", "xmpp-sip.kamailio.org")
...
</programlisting>
		</example>
	</section>
	<section>
		<title><varname>xmpp_host</varname> (string)</title>
		<para>
			The IP address or the hostname for the local XMPP/Jabber server to
			connect to when the backend is set to "component". For server mode,
			this is the IP address the XMPP module binds to listen for
			connections coming from other XMPP servers.
		</para>
		<para>
		<emphasis>
			Default value is "xmpp.example.org".
		</emphasis>
		</para>
		<example>
		<title>Set <varname>xmpp_host</varname> parameter</title>
		<programlisting format="linespecific">
...
 modparam("xmpp", "xmpp_host", "xmpp.kamailio.org")
...
</programlisting>
		</example>
	</section>
	<section>
		<title><varname>xmpp_port</varname> (integer)</title>
		<para>
			In component mode, this is the port the XMPP server component interface
			listens to. In server mode, this is the port the module listens to.
		</para>
		<para>
		<emphasis>
			Default value is "5347", if backend is set to "component" and "5269",
			if backend is set to "server".
		</emphasis>
		</para>
		<example>
		<title>Set <varname>xmpp_port</varname> parameter</title>
		<programlisting format="linespecific">
...
 modparam("xmpp", "xmpp_port", 5269)
...
</programlisting>
		</example>
	</section>

<section>
		<title><varname>xmpp_password</varname> (string)</title>
		<para>	The password of the local XMPP server.</para>
		<para>
			<emphasis>
				This is the password for the component interface on the XMPP server,
				when connecting as a component. Default password is "secret".
				When connecting to jabberd2, 
				you need to make sure this is the password configured in the file
				"c2s.xml". This is how the default configuration for the jabberd2
				looks like:
			</emphasis>
			<programlisting format="linespecific">
		<![CDATA[	<router>
	............... 
	<!-- Username/password to authenticate as --&gt;
    <user>jabberd</user>;          <!-- default: jabberd -->;
    <pass>secret</pass>;           <!-- default: secret -->;	]]>
			</programlisting>
		</para>
		<example>
		<title>Set <varname>xmpp_password</varname> parameter</title>
		<programlisting format="linespecific">
...
 modparam("xmpp", "xmpp_password", "secret")
...
</programlisting>
		</example>
	</section>
	<section>
		<title><varname>outbound_proxy</varname> (string)</title>
		<para>
		The SIP address used as next hop when sending the message. Very
		useful when using &kamailio; with a domain name not in DNS, or
		when using a separate &kamailio; instance for XMPP processing. If
		not set, the message will be sent to the address in destination
		URI.
		</para>
		<para>
		<emphasis>
		Default value is NULL.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>outbound_proxy</varname> parameter</title>
		<programlisting format="linespecific">
...
 modparam("xmpp", "outbound_proxy", "sip:kamailio.org;transport=tcp")
...
</programlisting>
		</example>
	</section>
	<section>
		<title><varname>gwmap</varname> (string)</title>
		<para>
		Set the mappings between SIP and XMPP domains. This parameter can
		be set many times, adding more SIP-XMPP domain mappings. Its value
		has to be a list of tokens like 'sipdomain=xmppdomain', separated
		by ';' (e.g., 'sipdomain1=xmppdomain1;sipdomain2=xmppdomain2'.
		</para>
		<para>
		When this parameter is set, the URI encoding based on 'domain_separator'
		is no longer enabled. The module will use only addresses in the format
		'username@domain'. If the source or destination address does not match
		a domain in gwmap, then the domain value is preserved when sending to
		the other protocol.
		</para>
		<para>
		<emphasis>
		Default value is NULL.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>gwmap</varname> parameter</title>
		<programlisting format="linespecific">
...
 modparam("xmpp", "gwmap", "sip.kamailio.org=xmpp.kamailio.org;abc.com=xyz.com")
 modparam("xmpp", "gwmap", "kamailio.net")
...
</programlisting>
		</example>
		<para>
		Based on the above parameter values, if there is a SIP message from
		'sip:alice@sip.kamailio.org' going to 'sip:bob@abc.com', the XMPP
		message to be sent is from 'alice@xmpp.kamailio.org' to
		'bob@xyz.com'.
		</para>
	</section>


	</section>

	<section>
	<title>Functions</title>
	<section>
		<title>
		<function moreinfo="none">xmpp_send_message()</function>
		</title>
		<para>
			Converts SIP messages to XMPP(jabber) messages, in order to be relayed
			to a XMPP(jabber) client.
		</para>
		
		<example>
		<title><function>xmpp_send_message()</function> usage</title>
		<programlisting format="linespecific">
...
xmpp_send_message();
...
</programlisting>
		</example>
	</section>
	</section>
	<section>
	<title>Configuration</title>
		<para>
		Next is presented a sample configuration file one can use to implement a
		standalone SIP-to-XMPP gateway. You can run an instance of &kamailio; on a
		separate machine or on different port with the following config, and have
		the main SIP server configured to forward all SIP requests for XMPP world
		to it.
		</para>
		<programlisting format="linespecific">
....
<xi:include href="openser-xmpp.cfg" parse="text"/>
....
</programlisting>

	</section>
</chapter>

