Clarified about conflict with Openfire Enterprise 3.3.3 or older.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@9366 b35dd754-fafc-0310-a699-88a17e54d16e

src/plugins/sip/readme.html

@@ -56,6 +56,10 @@ Copy the file, "sip.jar" into the plugins directory of your Openfire i
 then be automatically deployed. To upgrade to a new version just replace the "sip.jar" file with
 the newest version or you can just update the plugin from the admin console in the plugins page.
 </p>
+<p>
+If you are using Openfore Enterprise make sure that you are using Openfire Enterprise 3.4.0 or a latest
+version. Otherwise this plugin might fail to load due to a conflict of XMPP services.
+</p>
 
 <h2>Using the Plugin</h2>
 <p>