diff --git a/FM.cpp b/FM.cpp
index f4174fc..a165fab 100644
--- a/FM.cpp
+++ b/FM.cpp
@@ -411,6 +411,8 @@ void CFM::kerchunkRFState(bool validSignal)
     m_ackMinTimer.stop();
     m_callsignTimer.stop();
     m_statusTimer.stop();
+
+    serial.writeFMEOT();
   }
 }
 
@@ -423,6 +425,8 @@ void CFM::relayingRFState(bool validSignal)
       m_ackMinTimer.stop();
       m_timeoutTimer.stop();
       m_timeoutTone.start();
+
+      serial.writeFMEOT();
     }
   } else {
     DEBUG1("State to RELAYING_WAIT_RF");
@@ -574,10 +578,13 @@ void CFM::hangState(bool validRFSignal, bool validExtSignal)
       m_hangTimer.stop();
       m_statusTimer.stop();
 
+      serial.writeFMEOT();
+
       if (m_callsignAtEnd)
         sendCallsign();
 
       m_callsignTimer.stop();
+
     }
   }
 
diff --git a/SerialPort.cpp b/SerialPort.cpp
index d0bf4fc..a320ed1 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -71,6 +71,7 @@ const uint8_t MMDVM_FM_PARAMS3   = 0x62U;
 const uint8_t MMDVM_FM_PARAMS4   = 0x63U;
 const uint8_t MMDVM_FM_DATA      = 0x65U;
 const uint8_t MMDVM_FM_STATUS    = 0x66U;
+const uint8_t MMDVM_FM_EOT       = 0x67U;
 
 const uint8_t MMDVM_ACK          = 0x70U;
 const uint8_t MMDVM_NAK          = 0x7FU;
@@ -1286,7 +1287,24 @@ void CSerialPort::writeFMStatus(uint8_t status)
   reply[2U] = MMDVM_FM_STATUS;
   reply[3U] = status;
 
-  writeInt(1U, reply, 4);
+  writeInt(1U, reply, 4Us);
+}
+
+void CSerialPort::writeFMEOT()
+{
+  if (m_modemState != STATE_FM && m_modemState != STATE_IDLE)
+    return;
+
+  if (!m_fmEnable)
+    return;
+
+  uint8_t reply[10U];
+
+  reply[0U] = MMDVM_FRAME_START;
+  reply[1U] = 4U;
+  reply[2U] = MMDVM_FM_EOT;
+
+  writeInt(1U, reply, 3U);
 }
 
 void CSerialPort::writeCalData(const uint8_t* data, uint8_t length)
diff --git a/SerialPort.h b/SerialPort.h
index 2b5eb9a..a75731a 100644
--- a/SerialPort.h
+++ b/SerialPort.h
@@ -52,6 +52,7 @@ public:
 
   void writeFMData(const uint8_t* data, uint8_t length);
   void writeFMStatus(uint8_t status);
+  void writeFMEOT();
 
   void writeCalData(const uint8_t* data, uint8_t length);
   void writeRSSIData(const uint8_t* data, uint8_t length);