siptrace: docs for data_mode param

(cherry picked from commit 337c06b6b43606536f1d37ebfd6e4240aab9cf5a)

src/modules/siptrace/doc/siptrace_admin.xml

@@ -610,6 +610,26 @@ modparam("siptrace", "trace_mode", 1)
 ...
 modparam("siptrace", "trace_mode", 3)
 ...
+</programlisting>
+                </example>
+        </section>
+	<section id="siptrace.p.data_mode">
+                <title><varname>data_mode</varname> (integer)</title>
+				<para>
+					A set of flags to control what data is used for the trace.
+					If flag 1 (value 1) is set, then advertised address (when set)
+					is used instead of socket bind address.
+                </para>
+                <para>
+                Default value is <emphasis>0</emphasis>.
+                </para>
+                <example>
+                <title>Set <varname>data_mode</varname>
+                parameter</title>
+                <programlisting format="linespecific">
+...
+modparam("siptrace", "data_mode", 1)
+...
 </programlisting>
                 </example>
         </section>
@@ -949,4 +969,3 @@ onsend_route {
 	</section>
 
 </chapter>
-