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

<chapter>
    
    <title>&adminguide;</title>
    
    <section>
	<title>Overview</title>
	<para>
	    This module translates a numerical prefix into a domain and updates
		accordingly the request &uri;.
	</para>
	<para>
	    The module looks up at the R-&uri; part of a message and if the user
		part begins with an established prefix it will update the &uri;.
		Updating the uri consists of: remove the prefix from the user part of
		the uri and keep the rest as the user part of the new uri. The host
		and port are changed with the domain matched for the leading prefix and
		the domain in From URI.
	</para>
	<para>
	    &lt;prefix&gt;&lt;userid&gt;&lt;:password&gt;@&lt;mydomain.com&gt; ...
	</para>
	<para>
	    and the result will be:
	</para>
	<para>
	    &lt;userid&gt;&lt;:password&gt;@&lt;domain[:port]&gt;...
	</para>
	<example>
	    <title>prefix-domain translation</title>
	    <programlisting format="linespecific">
prefix=123, domain(FROM)=siphub.org

entry in database:
 sdomain=siphub.org
    domain[123]=alpha.org
    domain[124]=beta.org
    domain[125]=gamma.org
	
The RURI will be updated in the following way"
sip:12391001@mydomain.com  => sip:91001@alpha.org    
</programlisting>
	</example>
	<para>
	    The prefix could be prefixed by other digits. These digits
	    will not be used to look up the domain (the classic example, 00 used
		for international calls, then follows the country prefix). For more
		information on this, see 'prefix' parameter.
	</para>
	<itemizedlist>
	    <listitem>
		<para>
		    A sample config file is located in './doc/'.
		</para>
		</listitem>
		
		<listitem>
		<para>
			<acronym>MySQL</acronym> script to create the database needed by
			PDT is located in '../../scripts/mysql/pdt-create.sql'
		</para>
		<para>
			The database is loaded by &kamailio; only at start up time and 
			only cache is used to lookup domains. Check the MI Functions for
			adding/deleting prefix-domain pairs or reloading from database
			at runtime.
		</para>
		</listitem>

	    <listitem>
		<para>
		    Sample shell scripts to manage prefix-domain pairs are also located
			in './doc/' (pdt_fifo_list.sh).
		</para>
	    </listitem>
	</itemizedlist>
    </section>
    <section>
	<title>Dependencies</title>
	<section>
	    <title>&kamailio; Modules</title>
	    <para>
		The following modules must be loaded before this module:
	    	<itemizedlist>
		    <listitem>
			<para>
			    <emphasis>A &kamailio; database module (e.g., mysql,
				dbtext)</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>None</emphasis>.
			</para>
		    </listitem>
	    	</itemizedlist>
	    </para>
	</section>
    </section>
    <section>
	<title>Parameters</title>
	<section>
	    <title><varname>db_url</varname> (string)</title>
	    <para>
		URL of the database table to be used.
	    </para>
	    <para>
		<emphasis>
		    Default value is <quote>&defaultdb;</quote>.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>db_url</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pdt", "db_url", "&exampledb;")
...
</programlisting>
	    </example>
	</section>

	<section>
	    <title><varname>db_table</varname> (string)</title>
	    <para>
		Table name.
	    </para>
	    <para>
		<emphasis>
		    Default value is <quote>pdt</quote>.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>db_table</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pdt", "db_table", "pdt")
...
</programlisting>
	    </example>
	</section>

	<section>
	    <title><varname>sdomain_column</varname> (string)</title>
	    <para>
		Name of 'sdomain' column.
	    </para>
	    <para>
		<emphasis>
		    Default value is <quote>sdomain</quote>.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>sdomain_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pdt", "domain_column", "source_domain")
...
</programlisting>
	    </example>
	</section>

	<section>
	    <title><varname>prefix_column</varname> (string)</title>
	    <para>
		Name of 'prefix' column.
	    </para>
	    <para>
		<emphasis>
		    Default value is <quote>prefix</quote>.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>prefix_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pdt", "prefix_column", "prefix")
...
</programlisting>
	    </example>
	</section>

	<section>
	    <title><varname>domain_column</varname> (string)</title>
	    <para>
		Name of 'domain' column.
	    </para>
	    <para>
		<emphasis>
		    Default value is <quote>domain</quote>.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>domain_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pdt", "domain_column", "hostname")
...
</programlisting>
	    </example>
	</section>

	<section>
	    <title><varname>prefix</varname> (string)</title>
	    <para>
		Default leading prefix who denotes what &uri; needs to be translated
		- if it is NULL the module will not check the R-&uri; against it and
		the PDT prefix is considered starting from the first digit. Otherwise,
		the module will check first if the R-&uri; starts with it and will
		skip it to look up the domain.
	    </para>
	    <para>
		<emphasis>
		    Default value is NULL.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>prefix</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pdt", "prefix", "00")
...
</programlisting>
	    </example>
	</section>

	<section>
	    <title><varname>fetch_rows</varname> (integer)</title>
	    <para>
		Number of rows to be loaded in one step from database.
	    </para>
	    <para>
		<emphasis>
		    Default value is 1000.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>fetch_rows</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pdt", "fetch_rows", 4000)
...
</programlisting>
	    </example>
	</section>

	<section>
	    <title><varname>char_list</varname> (string)</title>
	    <para>
		The list with characters allowed in prefix.
		</para>
	    <para>
		<emphasis>
		    Default value is <quote>0123456789</quote>.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>char_list</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pdt", "char_list", "0123456789*+")
...
</programlisting>
	    </example>
	</section>

	<section>
	    <title><varname>check_domain</varname> (integer)</title>
	    <para>
		Module will check if destination domain is duplicated for same
		source domain (1 - check; 0 - don't check).
	    </para>
	    <para>
		<emphasis>
		    Default value is 1.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>check_domain</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pdt", "check_domain", 0)
...
</programlisting>
	    </example>
	</section>

    </section>
	
    <section>
	<title>Functions</title>
 	<section>
	    <title>
		<function moreinfo="none">prefix2domain(rewrite_mode, multidomain_mode)</function>
	    </title>
	    <para>
		Build a new &uri; if it is necessary. Returns 1 when the translation
		was made or there was nothing to translate (user part of the &uri; is
		empty, it does not match the prefix parameter or there is no domain
		associated with a possible prefix from user part).
		Returns -1 in error cases.
	    </para>
		<para>
		The translation is done based on lookup up for a entry in the database
		where the sdomain equals the domain in FROM uri, and the prefix matches
		the beginning of the user part of the RURI. If such an entry is found,
		then the domain in RURI is updated with the domain of this entry
		(sdomain, prefix, domain).
		</para>
		<para>
		There is also the possibility to have the translation of &uri; regardless of
		source domain. This can be achieved inserting in the database entries where
		sdomain has the value "*".
		</para>
		<para>
		The <quote>rewrite_mode</quote> parameter specifies whether to strip or not
		the prefix from user part. The possible values are:
		</para>
		<itemizedlist>
			<listitem>	  
				<para>0: the prefix is removed along with the leading prefix.</para>
			</listitem>	  
			<listitem>	  
				<para>1: only the leading prefix is removed.</para> 
			</listitem>	  
			<listitem>
				<para>2: the user part of the URI is not changed.</para>
			</listitem>	  
			<listitem>
				<para>$PV : any PV holding one of the above values.</para>
			</listitem>	  
		</itemizedlist>
		<para>
		The <quote>multidomain_mode</quote> parameter specifies the kind of multidomain
		support to use. The possible values are:
		</para>
		<itemizedlist>
			<listitem>
				<para>0 : Translation of &uri; regardless of source domain.</para>
			</listitem>	  
			<listitem>
				<para>1 :  Translation of &uri; using as source domain the domain
					in From-URI.</para>
			</listitem>			
			<listitem>
				<para>2 :  Translation of &uri; using as source domain the domain
				in From-URI. In case there is no entry for the required sdomain,
				it tries the translation using "*" as sdomain.</para>
			</listitem>
			<listitem>
				<para>$PV : any PV holding one of the above values.</para>
			</listitem>	  
		</itemizedlist>		
	    <para>
		This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.
		</para>
		<example>
		<title><function>prefix2domain</function> usage</title>
		<programlisting format="linespecific">
...
prefix2domain("2", "2");
...
$var(a) = 1;
prefix2domain("$var(a)", "2");
...
</programlisting>
	    </example>
	</section>
	<section>
	    <title>
		<function moreinfo="none">prefix2domain(rewrite_mode)</function>
	    </title>
		<para>The same as prefix2domain(rewrite_mode, "0"), that is without 
		multidomain support, translation of  &uri; being done regardless of 
		the source domain.
		</para>
		<programlisting format="linespecific">
...
prefix2domain("2");
...
</programlisting>
    </section>
	
	<section>
	    <title>
		<function moreinfo="none">prefix2domain()</function>
	    </title>
		<para>The same as prefix2domain("0", "0").</para>
		<programlisting format="linespecific">
...
prefix2domain();
...
</programlisting>
    </section>
	
	<section>
	    <title>
		<function moreinfo="none">pd_translate(sdomain, rewrite_mode)</function>
	    </title>
	    <para>
		Translate R-URI based on source domain and longest prefix matching.
		Returns 1 when the translation was made or there was nothing to translate.
		Returns -1 in error cases.
	    </para>
		<para>
		The translation is done based on lookup up for an entry in the database
		where the sdomain parameter equals the sdomain in database table.
		</para>
		<para>
		The <quote>sdomain</quote> parameter specifies the source domain to be
		used to match the longest prefix. Can be a static string or dynamic parameter
		with variables inside.
		</para>
		<para>
		The <quote>rewrite_mode</quote> parameter specifies whether to strip or not
		the prefix from user part. The possible values are:
		</para>
		<itemizedlist>
			<listitem>
				<para>0: the prefix is removed along with the leading prefix.</para>
			</listitem>
			<listitem>
				<para>1: only the leading prefix is removed.</para> 
			</listitem>
			<listitem>
				<para>2: the user part of the URI is not changed.</para>
			</listitem>
			<listitem>
				<para>$PV : any PV holding one of the above values.</para>
			</listitem>
		</itemizedlist>
	    <para>
		This function can be used from REQUEST_ROUTE, FAILURE_ROUTE or
		BRANCH_ROUTE.
		</para>
		<example>
		<title><function>pd_translate</function> usage</title>
		<programlisting format="linespecific">
...
pd_translate("$fd", "2");
...
pd_translate("*", "$var(a)");
...
</programlisting>
	    </example>
	</section>

    </section>
	
	<section>
		<title>MI Commands</title>
		<para>
		The database is loaded by &kamailio; at start up time.
		The module uses only the cache to look up domains. If you want to
		add or delete a new prefix-domain pair at runtime you have to use
		MI FIFO commands. All changes made via these commands are applied to
		database and the cache is updated correspondingly. 
		</para>

	<section>
		<title>
		<function moreinfo="none">pdt_list</function>
		</title>
		<para>
		Produces a listing of the entries prefixes/domains/sdomains.
		</para>
		<para>
		Name: <emphasis>pdt_list</emphasis>
		</para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>_sdomain_ : a source domain value. </para></listitem>	  
			<listitem><para>_prefix_ : a prefix value</para></listitem>	 
            <listitem><para>_domain_: a domain value </para></listitem>
		</itemizedlist>
		<para>
		"." (dot) means NULL value
		</para> 
		<para>
		The comparison operation is 'START WITH' -- if domain is 'a' then all domains 
		starting with 'a' are listed.
		</para>
		<para>
		MI FIFO Command Format:
		</para>
        <programlisting  format="linespecific">
		:pdt_list:_reply_fifo_file_
		_sdomain_
		_prefix_
		_domain_
		_empty_line_
		</programlisting>
		<para>
		 Examples:
		 <itemizedlist>
			<listitem><para><quote>pdt_list siph 2 .</quote>  : Lists the entries where sdomain is 
			starting with 'siph', prefix is starting with '2' and domain is anything
			</para></listitem>	

			<listitem><para><quote>pdt_list siph 2</quote>  : Lists the entries where sdomain is 
			starting with 'siph', prefix is starting with '2' and domain is anything
			</para></listitem>	
	 
			 <listitem><para><quote>pdt_list . 2 open</quote>  : Lists the entries where sdomain 
			 is anything, prefix starts with '2' and domain starts with 'open'.
			</para></listitem>	
		</itemizedlist>
		</para>
    </section>

	<section>
		<title>
		<function moreinfo="none">pdt_reload</function>
		</title>
		<para>
		Reload all sdomain-prefix-domain records from database.
		</para>
		<para>
		Name: <emphasis>pdt_reload</emphasis>
		</para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>none</para></listitem>	  
		</itemizedlist>
		<para>
		MI FIFO Command Format:
		</para>
        <programlisting  format="linespecific">
		:pdt_reload:_reply_fifo_file_
		_empty_line_
		</programlisting>
    </section>
    </section>

    <section>
	<title>Installation and Running</title>
    <para>
	Example shell scripts for MI FIFO commands are placed in './doc/'
	(pdt_fifo_add.sh, pdt_fifo_delete.sh, pdt_fifo_list.sh). 
	</para>
    </section>
</chapter>