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diff --git a/lib/misc_utils/message_sink_impl.h b/lib/misc_utils/message_sink_impl.h
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+++ b/lib/misc_utils/message_sink_impl.h
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+/* -*- c++ -*- */
+/* @file
+ * @author Roman Khassraf <rkhassraf@gmail.com>
+ * @section LICENSE
+ *
+ * Gr-gsm is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * Gr-gsm 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 gr-gsm; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef INCLUDED_GSM_MESSAGE_SINK_IMPL_H
+#define INCLUDED_GSM_MESSAGE_SINK_IMPL_H
+
+#include <grgsm/misc_utils/message_sink.h>
+
+namespace gr {
+  namespace gsm {
+
+    class message_sink_impl : public message_sink
+    {
+     private:
+      std::vector<std::string> d_messages;
+
+     public:
+      message_sink_impl();
+      ~message_sink_impl();
+      void process_message(pmt::pmt_t msg);
+      virtual std::vector<std::string> get_messages();
+    };
+
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_MESSAGE_SINK_IMPL_H */
+