kamailio/modules/uid_uri_db/doc/functions.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" 
   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

<section id="uri_db.functions" xmlns:xi="http://www.w3.org/2001/XInclude">
    <sectioninfo>
    </sectioninfo>

    <title>Functions</title>

    <section id="check_to">
	<title>
	    <function>check_to()</function>
	</title>
	<para>
	    Check To username against URI table or digest credentials.
	</para>
	<example>
	    <title><function>check_to</function> usage</title>
	    <programlisting>
...
if (check_to()) {
    ...
};
...
	    </programlisting>
	</example>
    </section>

    <section id="check_from">
	<title>
	    <function>check_from()</function>
	</title>
	<para>
	    Check From username against URI table or digest credentials.
	</para>
	<example>
	    <title><function>check_from</function> usage</title>
	    <programlisting>
...
if (check_from()) {
    ...
};
...
	    </programlisting>
	</example>
    </section>

    <section id="does_uri_exist">
	<title>
	    <function>does_uri_exist()</function>
	</title>
	<para>
	    Check if username in the request URI belongs to an existing user.
	</para>
	<example>
	    <title><function>does_uri_exist</function> usage</title>
	    <programlisting>
...
if (does_uri_exist()) {
    ...
};
...
	    </programlisting>
	</example>
    </section>

</section>