diff --git a/modem/arq_session_irs.py b/modem/arq_session_irs.py
index 74b2d6a5..f26fbf12 100644
--- a/modem/arq_session_irs.py
+++ b/modem/arq_session_irs.py
@@ -37,6 +37,9 @@ class ARQSessionIRS(arq_session.ARQSession):
         IRS_State.BURST_REPLY_SENT: {
             FRAME_TYPE.ARQ_BURST_FRAME.value: 'receive_data',
         },
+        IRS_State.ENDED: {
+            FRAME_TYPE.ARQ_BURST_FRAME.value: 'receive_data',
+        },
     }
 
     def __init__(self, config: dict, modem, dxcall: str, session_id: int):
diff --git a/tests/test_arq_session.py b/tests/test_arq_session.py
index 8a9c0d72..03419901 100644
--- a/tests/test_arq_session.py
+++ b/tests/test_arq_session.py
@@ -17,10 +17,10 @@ import numpy as np
 from event_manager import EventManager
 
 class TestModem:
-    def __init__(self):
+    def __init__(self, event_q):
         self.data_queue_received = queue.Queue()
         self.demodulator = unittest.mock.Mock()
-        self.event_manager = EventManager([queue.Queue()])
+        self.event_manager = EventManager([event_q])
 
     def transmit(self, mode, repeats: int, repeat_delay: int, frames: bytearray) -> bool:
         self.data_queue_received.put(frames)
@@ -31,22 +31,21 @@ class TestARQSession(unittest.TestCase):
     def setUpClass(cls):
         config_manager = CONFIG('modem/config.ini.example')
         cls.config = config_manager.read()
-
         cls.logger = structlog.get_logger("TESTS")
 
         # ISS
-        cls.iss_modem = TestModem()
         cls.iss_state_manager = StateManager(queue.Queue())
         cls.iss_event_queue = queue.Queue()
+        cls.iss_modem = TestModem(cls.iss_event_queue)
         cls.iss_frame_dispatcher = DISPATCHER(cls.config, 
                                           cls.iss_event_queue, 
                                           cls.iss_state_manager, 
                                           cls.iss_modem)
 
         # IRS
-        cls.irs_modem = TestModem()
         cls.irs_state_manager = StateManager(queue.Queue())
         cls.irs_event_queue = queue.Queue()
+        cls.irs_modem = TestModem(cls.irs_event_queue)
         cls.irs_frame_dispatcher = DISPATCHER(cls.config, 
                                           cls.irs_event_queue, 
                                           cls.irs_state_manager, 
@@ -55,18 +54,31 @@ class TestARQSession(unittest.TestCase):
         # Frame loss probability in %
         cls.loss_probability = 30
 
+        cls.channels_running = True
 
-
-    def channelWorker(self, modem_transmit_queue: queue, frame_dispatcher: DISPATCHER):
-        while True:
-            frame_bytes = modem_transmit_queue.get()
-            if random.randint(0, 100) < self.loss_probability:
-                self.logger.info(f"[{threading.current_thread().name}] Frame lost...")
+    def channelWorker(self, modem_transmit_queue: queue.Queue, frame_dispatcher: DISPATCHER):
+        while self.channels_running:
+            # Transfer data between both parties
+            try:
+                frame_bytes = modem_transmit_queue.get(timeout=1)
+                if random.randint(0, 100) < self.loss_probability:
+                    self.logger.info(f"[{threading.current_thread().name}] Frame lost...")
+                    continue
+                frame_dispatcher.new_process_data(frame_bytes, None, len(frame_bytes), 0, 0)
+            except queue.Empty:
                 continue
-            frame_dispatcher.new_process_data(frame_bytes, None, len(frame_bytes), 0, 0)
-
+        self.logger.info(f"[{threading.current_thread().name}] Channel closed.")
 
+    def waitForSession(self, q, outbound = False):
+            key = 'arq-transfer-outbound' if outbound else 'arq-transfer-inbound'
+            while True:
+                ev = q.get()
+                if key in ev and 'success' in ev[key]:
+                    self.logger.info(f"[{threading.current_thread().name}] {key} session ended.")
+                    break
+    
     def establishChannels(self):
+        self.channels_running = True
         self.iss_to_irs_channel = threading.Thread(target=self.channelWorker, 
                                                     args=[self.iss_modem.data_queue_received, 
                                                     self.irs_frame_dispatcher],
@@ -79,7 +91,12 @@ class TestARQSession(unittest.TestCase):
                                                     name = "IRS to ISS channel")
         self.irs_to_iss_channel.start()
 
-    def xtestARQSessionSmallPayload(self):
+    def waitAndCloseChannels(self):
+        self.waitForSession(self.iss_event_queue, True)
+        self.waitForSession(self.irs_event_queue, False)
+        self.channels_running = False
+
+    def testARQSessionSmallPayload(self):
         # set Packet Error Rate (PER) / frame loss probability
         self.loss_probability = 30
 
@@ -90,10 +107,11 @@ class TestARQSession(unittest.TestCase):
         }
         cmd = ARQRawCommand(self.config, self.iss_state_manager, self.iss_event_queue, params)
         cmd.run(self.iss_event_queue, self.iss_modem)
+        self.waitAndCloseChannels()
 
     def testARQSessionLargePayload(self):
         # set Packet Error Rate (PER) / frame loss probability
-        self.loss_probability = 50
+        self.loss_probability = 10
 
         self.establishChannels()
         params = {
@@ -103,6 +121,7 @@ class TestARQSession(unittest.TestCase):
         cmd = ARQRawCommand(self.config, self.iss_state_manager, self.iss_event_queue, params)
         cmd.run(self.iss_event_queue, self.iss_modem)
 
+        self.waitAndCloseChannels()
 
 if __name__ == '__main__':
     unittest.main()