diff --git a/lib/qa_utils/burst_sink_impl.cc b/lib/qa_utils/burst_sink_impl.cc
index bdc2192..5151bf6 100644
--- a/lib/qa_utils/burst_sink_impl.cc
+++ b/lib/qa_utils/burst_sink_impl.cc
@@ -90,6 +90,8 @@
         d_framenumbers.push_back(frame_nr);
         d_timeslots.push_back(header->timeslot);
         d_burst_data.push_back(burst_str.str());
+        d_sub_types.push_back(header->sub_type);
+        d_sub_slots.push_back(header->sub_slot);
     }
 
     std::vector<int> burst_sink_impl::get_framenumbers()
@@ -110,6 +112,14 @@
     {
         return d_bursts;
     }
+    std::vector<uint8_t> burst_sink_impl::get_sub_types()
+    {
+        return d_sub_types;
+    }
+    std::vector<uint8_t> burst_sink_impl::get_sub_slots()
+    {
+        return d_sub_slots;
+    }
   } /* namespace gsm */
 } /* namespace gr */
 
diff --git a/lib/qa_utils/burst_sink_impl.h b/lib/qa_utils/burst_sink_impl.h
index e87422d..15e3bcf 100644
--- a/lib/qa_utils/burst_sink_impl.h
+++ b/lib/qa_utils/burst_sink_impl.h
@@ -36,6 +36,8 @@
       std::vector<int> d_timeslots;
       std::vector<std::string> d_burst_data;
       pmt::pmt_t d_bursts;
+      std::vector<uint8_t> d_sub_types;
+      std::vector<uint8_t> d_sub_slots;
      public:
       burst_sink_impl();
       ~burst_sink_impl();
@@ -44,6 +46,8 @@
       virtual std::vector<int> get_timeslots();
       virtual std::vector<std::string> get_burst_data();
       virtual pmt::pmt_t get_bursts();
+      virtual std::vector<uint8_t> get_sub_types();
+      virtual std::vector<uint8_t> get_sub_slots();
     };
 
   } // namespace gsm
diff --git a/lib/qa_utils/burst_source_impl.cc b/lib/qa_utils/burst_source_impl.cc
index f415eaf..276ed0e 100644
--- a/lib/qa_utils/burst_source_impl.cc
+++ b/lib/qa_utils/burst_source_impl.cc
@@ -52,7 +52,8 @@
       : gr::block("burst_source",
               gr::io_signature::make(0, 0, 0),
               gr::io_signature::make(0, 0, 0)),
-              d_finished(false)
+              d_finished(false),
+              d_arfcn(0)
     {
         message_port_register_out(pmt::mp("out"));
         set_framenumbers(framenumbers);
@@ -85,6 +86,11 @@
         d_burst_data = burst_data;
     }
 
+    void burst_source_impl::set_arfcn(uint16_t arfcn)
+    {
+        d_arfcn = arfcn;
+    }
+
     bool burst_source_impl::start()
     {
         d_finished = false;
@@ -122,7 +128,7 @@
                 tap_header->timeslot = d_timeslots[i];
                 tap_header->frame_number = htobe32(d_framenumbers[i]);
                 tap_header->sub_type = GSMTAP_BURST_NORMAL;
-                tap_header->arfcn = 0;
+                tap_header->arfcn = d_arfcn;
                 tap_header->signal_dbm = 0;
                 tap_header->snr_db = 0;
 
diff --git a/lib/qa_utils/burst_source_impl.h b/lib/qa_utils/burst_source_impl.h
index cc7d9b4..bbcfd98 100644
--- a/lib/qa_utils/burst_source_impl.h
+++ b/lib/qa_utils/burst_source_impl.h
@@ -40,6 +40,7 @@
         std::vector<int> d_timeslots;
         std::vector<std::string> d_burst_data;
         bool d_finished;
+        uint16_t d_arfcn;
         void run();
      public:
         burst_source_impl(const std::vector<int> &framenumbers,
@@ -49,6 +50,7 @@
         virtual void set_framenumbers(const std::vector<int> &framenumbers);
         virtual void set_timeslots(const std::vector<int> &timeslots);
         virtual void set_burst_data(const std::vector<std::string> &burst_data);
+        virtual void set_arfcn(uint16_t arfcn);
         bool start();
         bool stop();
         bool finished();