diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 61f0858..1ddab6d 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -54,6 +54,8 @@
     misc_utils/burst_source_impl.cc
     misc_utils/burst_sink_qa_impl.cc
     misc_utils/burst_source_qa_impl.cc
+    misc_utils/message_file_sink_impl.cc
+    misc_utils/message_file_source_impl.cc
     decryption/decryption_impl.cc )
 
 add_library(gnuradio-grgsm SHARED ${grgsm_sources})
diff --git a/lib/misc_utils/message_file_sink_impl.cc b/lib/misc_utils/message_file_sink_impl.cc
new file mode 100644
index 0000000..7e52993
--- /dev/null
+++ b/lib/misc_utils/message_file_sink_impl.cc
@@ -0,0 +1,73 @@
+/* -*- 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.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include "message_file_sink_impl.h"
+#include <stdio.h>
+
+namespace gr {
+  namespace gsm {
+
+    message_file_sink::sptr
+    message_file_sink::make(const std::string &filename)
+    {
+      return gnuradio::get_initial_sptr
+        (new message_file_sink_impl(filename));
+    }
+
+    /*
+     * The private constructor
+     */
+    message_file_sink_impl::message_file_sink_impl(const std::string &filename)
+      : gr::block("message_file_sink",
+              gr::io_signature::make(0, 0, 0),
+              gr::io_signature::make(0, 0, 0)),
+              d_output_file(filename.c_str(), std::ofstream::binary)
+    {
+        message_port_register_in(pmt::mp("in"));
+        set_msg_handler(pmt::mp("in"), boost::bind(&message_file_sink_impl::process_message, this, _1));
+    }
+
+    /*
+     * Our virtual destructor.
+     */
+    message_file_sink_impl::~message_file_sink_impl()
+    {
+        if (d_output_file.is_open())
+        {
+            d_output_file.close();
+        }
+    }
+
+    void message_file_sink_impl::process_message(pmt::pmt_t msg)
+    {
+        std::string s = pmt::serialize_str(msg);
+        const char *serialized = s.data();
+        d_output_file.write(serialized, s.length());
+    }
+  } /* namespace gsm */
+} /* namespace gr */
+
diff --git a/lib/misc_utils/message_file_sink_impl.h b/lib/misc_utils/message_file_sink_impl.h
new file mode 100644
index 0000000..6757e69
--- /dev/null
+++ b/lib/misc_utils/message_file_sink_impl.h
@@ -0,0 +1,46 @@
+/* -*- 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_FILE_SINK_IMPL_H
+#define INCLUDED_GSM_MESSAGE_FILE_SINK_IMPL_H
+
+#include <grgsm/misc_utils/message_file_sink.h>
+#include <fstream>
+
+namespace gr {
+  namespace gsm {
+
+    class message_file_sink_impl : public message_file_sink
+    {
+     private:
+        std::ofstream d_output_file;
+     public:
+      message_file_sink_impl(const std::string &filename);
+      ~message_file_sink_impl();
+      void process_message(pmt::pmt_t msg);
+    };
+
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_MESSAGE_FILE_SINK_IMPL_H */
+
diff --git a/lib/misc_utils/message_file_source_impl.cc b/lib/misc_utils/message_file_source_impl.cc
new file mode 100644
index 0000000..540fe9e
--- /dev/null
+++ b/lib/misc_utils/message_file_source_impl.cc
@@ -0,0 +1,106 @@
+/* -*- 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.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include "message_file_source_impl.h"
+#include <stdio.h>
+
+#define PMT_SIZE 49
+
+namespace gr {
+  namespace gsm {
+
+    message_file_source::sptr
+    message_file_source::make(const std::string &filename)
+    {
+      return gnuradio::get_initial_sptr
+        (new message_file_source_impl(filename));
+    }
+
+    /*
+     * The private constructor
+     */
+    message_file_source_impl::message_file_source_impl(const std::string &filename)
+      : gr::block("message_file_source",
+              gr::io_signature::make(0, 0, 0),
+              gr::io_signature::make(0, 0, 0)),
+              d_input_file(filename.c_str(), std::ifstream::binary),
+              d_finished(false)
+    {
+        message_port_register_out(pmt::mp("out"));
+    }
+
+    /*
+     * Our virtual destructor.
+     */
+    message_file_source_impl::~message_file_source_impl()
+    {
+        if (d_finished == false){
+            d_finished = true;
+        }
+    }
+
+    bool message_file_source_impl::start()
+    {
+        d_finished = false;
+        d_thread = boost::shared_ptr<gr::thread::thread>
+            (new gr::thread::thread(boost::bind(&message_file_source_impl::run, this)));
+        return block::start();
+    }
+
+    bool message_file_source_impl::stop()
+    {
+        d_finished = true;
+        d_thread->interrupt();
+        d_thread->join();
+        return block::stop();
+    }
+
+    bool message_file_source_impl::finished()
+    {
+        return d_finished;
+    }
+
+    void message_file_source_impl::run()
+    {
+        char *unserialized = (char*)malloc(sizeof(char) * PMT_SIZE);
+        while (d_input_file.read(unserialized, PMT_SIZE) && !d_finished)
+        {
+            if (d_input_file.bad())
+            {
+                break;
+            }
+
+            std::string s(unserialized, PMT_SIZE);
+            pmt::pmt_t burst = pmt::deserialize_str(s);
+            message_port_pub(pmt::mp("out"), burst);
+        }
+        d_input_file.close();
+        post(pmt::mp("system"), pmt::cons(pmt::mp("done"), pmt::from_long(1)));
+    }
+  } /* namespace gsm */
+} /* namespace gr */
+
diff --git a/lib/misc_utils/message_file_source_impl.h b/lib/misc_utils/message_file_source_impl.h
new file mode 100644
index 0000000..42f65cb
--- /dev/null
+++ b/lib/misc_utils/message_file_source_impl.h
@@ -0,0 +1,50 @@
+/* -*- 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_FILE_SOURCE_IMPL_H
+#define INCLUDED_GSM_MESSAGE_FILE_SOURCE_IMPL_H
+
+#include <grgsm/misc_utils/message_file_source.h>
+#include <fstream>
+
+namespace gr {
+  namespace gsm {
+
+    class message_file_source_impl : public message_file_source
+    {
+     private:
+        boost::shared_ptr<gr::thread::thread> d_thread;
+        std::ifstream d_input_file;
+        bool d_finished;
+        void run();
+     public:
+        message_file_source_impl(const std::string &filename);
+        ~message_file_source_impl();
+        bool start();
+        bool stop();
+        bool finished();
+    };
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_MESSAGE_FILE_SOURCE_IMPL_H */
+