diff --git a/apps/grgsm_trx b/apps/grgsm_trx
new file mode 100755
index 0000000..fbc9350
--- /dev/null
+++ b/apps/grgsm_trx
@@ -0,0 +1,155 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+# GR-GSM based transceiver
+#
+# (C) 2016-2017 by Vadim Yanitskiy <axilirator@gmail.com>
+#
+# All Rights Reserved
+#
+# This program 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 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+import signal
+import getopt
+import sys
+
+from ctrl_if_bb import CTRLInterfaceBB
+from radio_if import RadioInterface
+from fake_pm import FakePM
+
+COPYRIGHT = \
+	"Copyright (C) 2016-2017 by Vadim Yanitskiy <axilirator@gmail.com>\n" \
+	"License GPLv2+: GNU GPL version 2 or later " \
+	"<http://gnu.org/licenses/gpl.html>\n" \
+	"This is free software: you are free to change and redistribute it.\n" \
+	"There is NO WARRANTY, to the extent permitted by law.\n"
+
+class Application:
+	# Application variables
+	remote_addr = "127.0.0.1"
+	base_port = 5700
+
+	# PHY specific
+	phy_sample_rate = 2000000
+	phy_subdev_spec = False
+	phy_gain = 30
+	phy_args = ""
+	phy_ppm = 0
+
+	def __init__(self):
+		self.print_copyright()
+		self.parse_argv()
+
+		# Set up signal handlers
+		signal.signal(signal.SIGINT, self.sig_handler)
+
+	def run(self):
+		# Init Radio interface
+		self.radio = RadioInterface(self.phy_args, self.phy_subdev_spec,
+			self.phy_sample_rate, self.phy_gain, self.phy_ppm,
+			self.remote_addr, self.base_port)
+
+		# Power measurement emulation
+		# Noise: -120 .. -105
+		# BTS: -75 .. -50
+		self.pm = FakePM(-120, -105, -75, -50)
+
+		# Init TRX CTRL interface
+		self.server = CTRLInterfaceBB(self.remote_addr,
+			self.base_port + 101, self.base_port + 1,
+			self.radio, self.pm)
+
+		print("[i] Init complete")
+
+		# Enter main loop
+		while True:
+			self.server.loop()
+
+	def shutdown(self):
+		print("[i] Shutting down...")
+		self.server.shutdown()
+		self.radio.shutdown()
+
+	def print_copyright(self):
+		print(COPYRIGHT)
+
+	def print_help(self):
+		s  = " Usage: " + sys.argv[0] + " [options]\n\n" \
+			 " Some help...\n" \
+			 "  -h --help         this text\n\n"
+
+		# TRX specific
+		s += " TRX interface specific\n" \
+			 "  -s --remote-addr  Set remote address (default 127.0.0.1)\n" \
+			 "  -p --base-port    Set base port number (default 5700)\n\n"
+
+		# PHY specific
+		s += " Radio interface specific\n" \
+			 "  -a --device-args  Set device arguments\n" \
+			 "  -s --sample-rate  Set PHY sample rate (default 2000000)\n" \
+			 "  -S --subdev-spec  Set PHY sub-device specification\n" \
+			 "  -g --gain         Set PHY gain (default 30)\n" \
+			 "     --ppm          Set PHY frequency correction (default 0)\n"
+
+		print(s)
+
+	def parse_argv(self):
+		try:
+			opts, args = getopt.getopt(sys.argv[1:],
+				"a:p:i:s:S:g:h",
+				["help", "remote-addr=", "base-port=", "device-args=",
+				"gain=", "subdev-spec=", "sample-rate=", "ppm="])
+		except getopt.GetoptError as err:
+			# Print(help and exit)
+			self.print_help()
+			print("[!] " + str(err))
+			sys.exit(2)
+
+		for o, v in opts:
+			if o in ("-h", "--help"):
+				self.print_help()
+				sys.exit(2)
+
+			# TRX specific
+			elif o in ("-i", "--remote-addr"):
+				self.remote_addr = v
+			elif o in ("-p", "--base-port"):
+				if int(v) >= 0 and int(v) <= 65535:
+					self.base_port = int(v)
+				else:
+					print("[!] The port number should be in range [0-65536]")
+					sys.exit(2)
+
+			# PHY specific
+			elif o in ("-a", "--device-args"):
+				self.phy_args = v
+			elif o in ("-g", "--gain"):
+				self.phy_gain = int(v)
+			elif o in ("-S", "--subdev-spec"):
+				self.phy_subdev_spec = v
+			elif o in ("-s", "--sample-rate"):
+				self.phy_sample_rate = int(v)
+			elif o in ("--ppm"):
+				self.phy_ppm = int(v)
+
+	def sig_handler(self, signum, frame):
+		print("Signal %d received" % signum)
+		if signum is signal.SIGINT:
+			self.shutdown()
+			sys.exit(0)
+
+if __name__ == '__main__':
+	app = Application()
+	app.run()