dialog Document states of a dialog

The states are stored in the state_column in the database, but was only explained in source code previously

modules/dialog/doc/dialog_admin.xml

@@ -58,6 +58,30 @@
 	dialog timeout is reset each time a sequential request is processed.
 	</para>
 	</section>
+	<section>
+	<title>Dialog states</title>
+	<para>
+	Dialogs have states that are shown in the RPC interface as well as stored
+	in the database. 
+	</para>
+	<itemizedlist>
+		<listitem>
+			<para><emphasis>1</emphasis> : Unconfirmed dialog</para>
+		</listitem>
+		<listitem>
+			<para><emphasis>2</emphasis> : Early dialog (ringing)</para>
+		</listitem>
+		<listitem>
+			<para><emphasis>3</emphasis> : Confirmed dialog (waiting for ACK)</para>
+		</listitem>
+		<listitem>
+			<para><emphasis>4</emphasis> : Confirmed dialog (active call)</para>
+		</listitem>
+		<listitem>
+			<para><emphasis>5</emphasis> : Deleted dialog</para>
+		</listitem>
+	</itemizedlist>
+	</section>
 
 	<section>
 	<title>Dialog profiling</title>