diff --git a/python/qa_gsm_bcch_ccch_sdcch4_demapper.py b/python/qa_gsm_bcch_ccch_sdcch4_demapper.py
new file mode 100644
index 0000000..c71a2e1
--- /dev/null
+++ b/python/qa_gsm_bcch_ccch_sdcch4_demapper.py
@@ -0,0 +1,211 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# @file
+# @author (C) 2019 by Vasil Velichkov <vvvelichkov@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.
+#
+#
+
+import unittest
+import numpy as np
+from gnuradio import gr, gr_unittest, blocks
+import grgsm
+import pmt
+import qa_gsm_demapper_data as test_data
+
+class qa_bcch_ccch_sdcch4_demapper (gr_unittest.TestCase):
+
+    def setUp (self):
+        self.tb = gr.top_block ()
+        self.maxDiff = None
+
+    def tearDown (self):
+        self.tb = None
+
+    @unittest.expectedFailure
+    def test_downlink (self):
+        """
+           BCCH_CCCH_SDCCH4 demapper downlink test
+        """
+        src = grgsm.burst_source(test_data.frames, test_data.timeslots, test_data.bursts)
+        src.set_arfcn(0); # downlink
+        demapper = grgsm.gsm_bcch_ccch_sdcch4_demapper(timeslot_nr=0)
+        dst = grgsm.burst_sink()
+
+        self.tb.msg_connect(src, "out", demapper, "bursts")
+        self.tb.msg_connect(demapper, "bursts", dst, "in")
+        self.tb.run ()
+
+        b = test_data.bursts
+        self.assertEqual([
+            b[  2], b[  3], b[  4], b[  5], #BCCH
+            b[  6], b[  7], b[  8], b[  9], #CCCH    skip 2
+            b[ 12], b[ 13], b[ 14], b[ 15], #CCCH
+            b[ 16], b[ 17], b[ 18], b[ 19], #CCCH    skip 2
+            b[ 22], b[ 23], b[ 24], b[ 25], #SDCCH 0
+            b[ 26], b[ 27], b[ 28], b[ 29], #SDCCH 1 skip 2
+            b[ 32], b[ 33], b[ 34], b[ 35], #SDCCH 2
+            b[ 36], b[ 37], b[ 38], b[ 39], #SDCCH 3 skip 2
+            b[ 42], b[ 43], b[ 44], b[ 45], #SACCH 0
+            b[ 46], b[ 47], b[ 48], b[ 49], #SACCH 1 skip 3
+            b[ 53], b[ 54], b[ 55], b[ 56], #BCCH
+            b[ 57], b[ 58], b[ 59], b[ 60], #CCCH    skip 2
+            b[ 63], b[ 64], b[ 65], b[ 66], #CCCH
+            b[ 67], b[ 68], b[ 69], b[ 70], #CCCH    skip 2
+            b[ 73], b[ 74], b[ 75], b[ 76], #SDCCH 0
+            b[ 77], b[ 78], b[ 79], b[ 80], #SDCCH 1 skip 2
+            b[ 83], b[ 84], b[ 85], b[ 86], #SDCCH 2
+            b[ 87], b[ 88], b[ 89], b[ 90], #SDCCH 3 skip 2
+            b[ 93], b[ 94], b[ 95], b[ 96], #SACCH 1
+            b[ 97], b[ 98], b[ 99], b[100], #SACCH 2 skip 3
+            b[104], b[105], b[106], b[107]  #BCCH
+            ], list(dst.get_burst_data()))
+
+        self.assertEqual([
+              1,   1,   1,   1, #BCCH
+              2,   2,   2,   2, #CCCH
+              2,   2,   2,   2, #CCCH
+              2,   2,   2,   2, #CCCH
+              7,   7,   7,   7, #SDCCH 0
+              7,   7,   7,   7, #SDCCH 1
+              7,   7,   7,   7, #SDCCH 2
+              7,   7,   7,   7, #SDCCH 3
+            135, 135, 135, 135, #SACCH 0
+            135, 135, 135, 135, #SACCH 1
+              1,   1,   1,   1, #BCCH
+              2,   2,   2,   2, #CCCH
+              2,   2,   2,   2, #CCCH
+              2,   2,   2,   2, #CCCH
+              7,   7,   7,   7, #SDCCH 0
+              7,   7,   7,   7, #SDCCH 1
+              7,   7,   7,   7, #SDCCH 2
+              7,   7,   7,   7, #SDCCH 3
+            135, 135, 135, 135, #SACCH 2
+            135, 135, 135, 135, #SACCH 3
+              1,   1,   1,   1, #BCCH
+            ], list(dst.get_sub_types()))
+
+        self.assertEqual([
+            0, 0, 0, 0, #BCCH
+            0, 0, 0, 0, #CCCH
+            1, 1, 1, 1, #CCCH
+            2, 2, 2, 2, #CCCH
+            0, 0, 0, 0, #SDCCH 0
+            1, 1, 1, 1, #SDCCH 1
+            2, 2, 2, 2, #SDCCH 2
+            3, 3, 3, 3, #SDCCH 3
+            0, 0, 0, 0, #SACCH 0
+            1, 1, 1, 1, #SACCH 1
+            0, 0, 0, 0, #BCCH
+            0, 0, 0, 0, #CCCH
+            1, 1, 1, 1, #CCCH
+            2, 2, 2, 2, #CCCH
+            0, 0, 0, 0, #SDCCH 0
+            1, 1, 1, 1, #SDCCH 1
+            2, 2, 2, 2, #SDCCH 2
+            3, 3, 3, 3, #SDCCH 3
+            2, 2, 2, 2, #SACCH 2
+            3, 3, 3, 3, #SACCH 3
+            0, 0, 0, 0, #BCCH
+            ], list(dst.get_sub_slots()))
+
+    @unittest.expectedFailure
+    def test_uplink (self):
+        """
+           BCCH_CCCH_SDCCH4 demapper uplink test
+        """
+        src = grgsm.burst_source(test_data.frames, test_data.timeslots, test_data.bursts)
+        src.set_arfcn(0x2240); #uplink flag is 40
+        demapper = grgsm.gsm_bcch_ccch_sdcch4_demapper(timeslot_nr=0)
+        dst = grgsm.burst_sink()
+
+        self.tb.msg_connect(src, "out", demapper, "bursts")
+        self.tb.msg_connect(demapper, "bursts", dst, "in")
+        self.tb.run ()
+
+        b = test_data.bursts
+        self.assertEqual(b, list(dst.get_burst_data()))
+
+        self.assertEqual([
+              7,   7,   7,   7, #SDCCH 3
+              3,   3,           #RACCH
+            135, 135, 135, 135, #SACCH 2
+            135, 135, 135, 135, #SACCH 3
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,      #RACCH
+              7,   7,   7,   7, #SDCCH 0
+              7,   7,   7,   7, #SDCCH 1
+              3,   3,           #RACCH
+              7,   7,   7,   7, #SDCCH 2
+              7,   7,   7,   7, #SDCCH 3
+              3,   3,           #RACCH
+            135, 135, 135, 135, #SACCH 0
+            135, 135, 135, 135, #SACCH 1
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,      #RACCH
+              7,   7,   7,   7, #SDCCH 0
+              7,   7,   7,   7, #SDCCH 1
+              3,   3,           #RACCH
+              7,   7,   7,   7, #SDCCH 2
+              7,   7,   7,   7, #SDCCH 3
+              3,   3,           #RACCH
+            ], list(dst.get_sub_types()))
+
+        self.assertEqual([
+            3, 3, 3, 3, #SDCCH 3
+            0, 0,       #RACCH
+            2, 2, 2, 2, #SACCH 2
+            3, 3, 3, 3, #SACCH 3
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0,    #RACCH
+            0, 0, 0, 0, #SDCCH 0
+            1, 1, 1, 1, #SDCCH 1
+            0, 0,       #RACCH
+            2, 2, 2, 2, #SDCCH 2
+            3, 3, 3, 3, #SDCCH 3
+            0, 0,       #RACCH
+            0, 0, 0, 0, #SACCH 0
+            1, 1, 1, 1, #SACCH 1
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0,    #RACCH
+            0, 0, 0, 0, #SDCCH 0
+            1, 1, 1, 1, #SDCCH 1
+            0, 0,       #RACCH
+            2, 2, 2, 2, #SDCCH 2
+            3, 3, 3, 3, #SDCCH 3
+            0, 0,       #RACCH
+            ], list(dst.get_sub_slots()))
+
+if __name__ == '__main__':
+    gr_unittest.run(qa_bcch_ccch_sdcch4_demapper, "qa_bcch_ccch_sdcch4_demapper.xml")