better shutdown order

git-svn-id: http://svn.berlios.de/svnroot/repos/sems/trunk@1089 8eb893ce-cfd4-0310-b710-fb5ebe64c474

core/sems.cpp

@@ -102,10 +102,10 @@ static void sig_usr_un(int signo)
 
       need_clean.set(false);
 
-      AmRtpReceiver::dispose();
-
       AmSessionContainer::dispose();
 
+      AmRtpReceiver::dispose();
+
       AmServer::dispose();
 
       AmMediaProcessor::dispose();