@@ -1813,6 +1813,52 @@ save("location", "0x2");

 ...

 reg_send_reply();

 ...

+</programlisting>

+		</example>

+	</section>

+	<section id="registrar.f.reg_from_user">

+		<title>

+		<function moreinfo="none">reg_from_user(ultable, uri, mode)</function>

+		</title>

+		<para>

+			The function returns true if the SIP message comes from the user

+			identified by 'uri' parameter by matching the associated location

+			records. The matching is done with the field 'received' if it is set,

+			otherwise with the contact address.

+		</para>

+		<para>Meaning of the parameters is as follows:</para>

+		<itemizedlist>

+		<listitem>

+			<para>

+			<emphasis>ultable</emphasis> - user location table (e.g., 'location')

+			</para>

+		</listitem>

+		<listitem>

+			<para>

+			<emphasis>uri</emphasis> - SIP URI to identify the location records

+			to match against.

+			</para>

+		</listitem>

+		<listitem>

+			<para>

+			<emphasis>mode</emphasis> - matching mode (int) - host part (IP address)

+			is matched always. If mode has bit 1 set (value 1), then the port is

+			matched as well. If mode has bit 2 set (value 2), then the protocol

+			is matched as well.

+			</para>

+		</listitem>

+		</itemizedlist>

+		<para>

+		This function can be used from ANY_ROUTE.

+		</para>

+		<example>

+		<title><function>reg_from_user</function> usage</title>

+		<programlisting format="linespecific">

+...

+if(reg_from_user("location", "sip:alice@server.com", "0")) {

+    # message coming from where 'alice' sent before a REGISTER request

+}

+...

 </programlisting>

 		</example>

 	</section>