diff --git a/SerialPort.cpp b/SerialPort.cpp
index 7fbd004..a81e8a5 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -318,6 +318,28 @@ void SerialPort::process()
 #endif
                     break;
 
+                case CMD_DMR_CLEAR1:
+#if defined(DUPLEX)
+                    if (m_dmrEnable) {
+                        if (m_modemState == STATE_IDLE || m_modemState == STATE_P25)
+                            dmrTX.resetFifo1();
+                    }
+#else
+                    sendNAK(RSN_INVALID_REQUEST);
+#endif
+                    break;
+                case CMD_DMR_CLEAR2:
+#if defined(DUPLEX)
+                    if (m_dmrEnable) {
+                        if (m_modemState == STATE_IDLE || m_modemState == STATE_P25)
+                            dmrTX.resetFifo2();
+                    }
+#else
+                    sendNAK(RSN_INVALID_REQUEST);
+#endif
+                    break;
+
+
                 /** Project 25 */
                 case CMD_P25_DATA:
                     if (m_p25Enable) {
@@ -356,6 +378,12 @@ void SerialPort::process()
                         sendNAK(err);
                     }
                     break;
+                case CMD_NXDN_CLEAR:
+                    if (m_nxdnEnable) {
+                        if (m_modemState == STATE_IDLE || m_modemState == STATE_P25)
+                            nxdnTX.clear();
+                    }
+                    break;
 
                 default:
                     // Handle this, send a NAK back
diff --git a/SerialPort.h b/SerialPort.h
index f70e54f..81ec3ef 100644
--- a/SerialPort.h
+++ b/SerialPort.h
@@ -93,6 +93,8 @@ enum DVM_COMMANDS {
     CMD_DMR_START = 0x1DU,
     CMD_DMR_ABORT = 0x1EU,
     CMD_DMR_CACH_AT_CTRL = 0x1FU,
+    CMD_DMR_CLEAR1 = 0x20U,
+    CMD_DMR_CLEAR2 = 0x21U,
 
     CMD_P25_DATA = 0x31U,
     CMD_P25_LOST = 0x32U,
@@ -100,6 +102,7 @@ enum DVM_COMMANDS {
 
     CMD_NXDN_DATA = 0x41U,
     CMD_NXDN_LOST = 0x42U,
+    CMD_NXDN_CLEAR = 0x43U,
 
     CMD_ACK = 0x70U,
     CMD_NAK = 0x7FU,