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diff --git a/src/anyrtpproxy/callIdQueue.h b/src/anyrtpproxy/callIdQueue.h
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+++ b/src/anyrtpproxy/callIdQueue.h
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+/*
+ *  anytun
+ *
+ *  The secure anycast tunneling protocol (satp) defines a protocol used
+ *  for communication between any combination of unicast and anycast
+ *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
+ *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
+ *  ethernet, ip, arp ...). satp directly includes cryptography and
+ *  message authentication based on the methodes used by SRTP.  It is
+ *  intended to deliver a generic, scaleable and secure solution for
+ *  tunneling and relaying of packets of any protocol.
+ *
+ *
+ *  Copyright (C) 2007 anytun.org <satp@wirdorange.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __CALLID_QUEUE_H__
+#define __CALLID_QUEUE_H__
+
+#include <queue>
+#include <string>
+
+#include "../threadUtils.hpp"
+
+class CallIdQueue
+{
+public:
+  static CallIdQueue& instance(); 
+  
+  std::string& front();
+  void push(std::string c);
+  void pop();
+
+private:
+  CallIdQueue();
+  ~CallIdQueue();
+
+  void operator=(const CallIdQueue &src);
+  CallIdQueue(const CallIdQueue &src);
+
+  static CallIdQueue* inst;
+  static ::Mutex instMutex;
+  class instanceCleaner {
+    public: ~instanceCleaner() {
+      if(CallIdQueue::inst != 0)
+        delete CallIdQueue::inst;
+    }
+  };
+  friend class instanceCleaner;
+
+  ::Mutex mutex_;
+  Semaphore sem_;
+  std::queue<std::string> callids_;
+};
+
+extern CallIdQueue& gCallIdQueue;
+
+#endif