diff --git a/lib/decoding/tch_f_decoder_impl.cc b/lib/decoding/tch_f_decoder_impl.cc
index f409d37..b9aa057 100644
--- a/lib/decoding/tch_f_decoder_impl.cc
+++ b/lib/decoding/tch_f_decoder_impl.cc
@@ -52,6 +52,7 @@
       d_collected_bursts_num(0),
       d_boundary_check(boundary_check),
       d_boundary_decode(!boundary_check),
+      d_header_sent(false),
       mBlockCoder(0x10004820009ULL, 40, 224),
       mU(228),
       mP(mU.segment(184,40)),
@@ -65,18 +66,11 @@
       mClass1A_d(mTCHD.head(50)),
       mTCHParity(0x0b, 3, 50)
     {
-        d_speech_file = fopen( file.c_str(), "wb" );
-        if (d_speech_file == NULL)
-        {
-            throw std::runtime_error("TCH/F Decoder: can't open file\n");
-        }
-
-        const unsigned char amr_nb_magic[6] = { 0x23, 0x21, 0x41, 0x4d, 0x52, 0x0a };
-
-        if (d_tch_mode != TCH_FS)
-        {
-            fwrite(amr_nb_magic, 1, 6, d_speech_file);
-        }
+        //setup input/output ports
+        message_port_register_in(pmt::mp("bursts"));
+        set_msg_handler(pmt::mp("bursts"), boost::bind(&tch_f_decoder_impl::decode, this, _1));
+        message_port_register_out(pmt::mp("msgs"));
+        message_port_register_out(pmt::mp("voice"));    
 
         int j, k, B;
         for (k = 0; k < CONV_SIZE; k++)
@@ -86,11 +80,6 @@
             interleave_trans[k] = B * 114 + j;
         }
 
-        //setup input/output ports
-        message_port_register_in(pmt::mp("bursts"));
-        set_msg_handler(pmt::mp("bursts"), boost::bind(&tch_f_decoder_impl::decode, this, _1));
-        message_port_register_out(pmt::mp("msgs"));
-
         setCodingMode(mode);
     }
 
@@ -100,9 +89,20 @@
 
     void tch_f_decoder_impl::decode(pmt::pmt_t msg)
     {
+        if(!d_header_sent)
+        {
+            if (d_tch_mode != TCH_FS)
+            {
+                const unsigned char amr_nb_magic[7] = "#!AMR\n";
+                message_port_pub(pmt::mp("voice"), pmt::cons(pmt::PMT_NIL, pmt::make_blob(amr_nb_magic,6)));
+            }
+            d_header_sent = true;
+        }
+
+
         d_bursts[d_collected_bursts_num] = msg;
         d_collected_bursts_num++;
-
+        
         bool stolen = false;
 
         if (d_collected_bursts_num == 8)
@@ -329,7 +329,7 @@
                         amrFrame.pack(frameBuffer);
 
                     }
-                    fwrite(frameBuffer, 1 , mTCHFrameLength, d_speech_file);
+                    message_port_pub(pmt::mp("voice"), pmt::cons(pmt::PMT_NIL, pmt::make_blob(frameBuffer,mTCHFrameLength)));
                 }
             }
             else
@@ -378,7 +378,7 @@
                     // mTCHD.unmap(mAMRBitOrder, payload.size(), payload);
                     mTCHD.copyTo(payload);
                     amrFrame.pack(frameBuffer);
-                    fwrite(frameBuffer, 1 , mAMRFrameLth, d_speech_file);
+                    message_port_pub(pmt::mp("voice"), pmt::cons(pmt::PMT_NIL, pmt::make_blob(frameBuffer,mAMRFrameLth)));
                 }
             }
         }