rtpproxy: Update rtpproxy module documentation.

o Correct description of the timeout_socket;

o Document timeout_tag_pv;

o Update (c);

o Remove reference to the ngcp-mediaproxy-ng which does not exist
  anymore.

src/modules/rtpproxy/doc/rtpproxy.xml

@@ -67,7 +67,7 @@
 		</editor>
 	</authorgroup>
 	<copyright>
-		<year>2003-2008</year>
+		<year>2003-2023</year>
 		<holder>Sippy Software, Inc.</holder>
 	</copyright>
 	<copyright>

src/modules/rtpproxy/doc/rtpproxy_admin.xml

@@ -18,11 +18,7 @@
 	<title>Overview</title>
 	<para>
 		This is a module that enables media streams to be proxied
-		via an rtpproxy.  Rtpproxies know to work with this module
-		are Sippy RTPproxy <ulink url="http://www.rtpproxy.org"></ulink>
-		and ngcp-rtpproxy-ng
-		<ulink url="http://deb.sipwise.com/spce/2.6/pool/main/n/ngcp-mediaproxy-ng"></ulink>.
-		Some features of the rtpproxy module apply only to one of the two rtpproxies.
+		via the Sippy RTPproxy <ulink url="http://www.rtpproxy.org"></ulink>.
 	</para>
 	</section>
 
@@ -235,7 +231,37 @@ modparam("rtpproxy", "nortpproxy_str", "a=sdpmangled:yes\r\n")
 		<title>Set <varname>timeout_socket</varname> parameter</title>
 		<programlisting format="linespecific">
 ...
-modparam("rtpproxy", "timeout_socket", "xmlrpc:http://127.0.0.1:8000/RPC2")
+modparam("rtpproxy", "timeout_socket", "tcp:127.0.0.1:8000")
+...
+</programlisting>
+		</example>
+	</section>
+	<section id="rtpproxy.p.timeout_tag_pv">
+		<title><varname>timeout_tag_pv</varname> (string)</title>
+		<para>
+		The parameter devines the AVP of the string to be provided to the
+		RTP-Proxy.
+		</para>
+		<para>
+		The content of the AVP must be a valid URL-encoded string with
+		no spaces.
+		It will be decoded and send by the RTP proxy to the timeout socket if the
+		media timeout has happened.
+		</para>
+		<para>
+		This parameter is required in order for the timeout notification
+		mechanism to work properly.
+		</para>
+		<para>
+		<emphasis>
+			Default value is <quote></quote> (nothing).
+		</emphasis>
+		</para>
+		<example>
+		<title>Set <varname>timeout_tag_pv</varname> parameter</title>
+		<programlisting format="linespecific">
+...
+modparam("rtpproxy", "timeout_tag_pv", "$avp(rtpp_ntag)")
 ...
 </programlisting>
 		</example>