diff --git a/P25Control.cpp b/P25Control.cpp
index d890ddd..5980991 100644
--- a/P25Control.cpp
+++ b/P25Control.cpp
@@ -1,5 +1,5 @@
 /*
-*   Copyright (C) 2016,2017 by Jonathan Naylor G4KLX
+*   Copyright (C) 2016,2017,2018 by Jonathan Naylor G4KLX
 *
 *   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
@@ -150,6 +150,9 @@ bool CP25Control::writeModem(unsigned char* data, unsigned int len)
 		case P25_DUID_LDU1:
 			duid = P25_DUID_LDU2;
 			break;
+		case P25_DUID_PDU:
+			duid = P25_DUID_PDU;
+			break;
 		default:
 			break;
 		}
@@ -358,6 +361,9 @@ bool CP25Control::writeModem(unsigned char* data, unsigned int len)
 				writeQueueRF(data, P25_TERM_FRAME_LENGTH_BYTES + 2U);
 			}
 		}
+	} else if (duid == P25_DUID_PDU) {
+		LogMessage("P25, PDU received");
+		CUtils::dump("P25, PDU data", data + 2U, P25_LDU_FRAME_LENGTH_BYTES);
 	}
 
 	return false;
diff --git a/P25NID.cpp b/P25NID.cpp
index 0bcd45f..145dce4 100644
--- a/P25NID.cpp
+++ b/P25NID.cpp
@@ -1,5 +1,5 @@
 /*
-*   Copyright (C) 2016 by Jonathan Naylor G4KLX
+*   Copyright (C) 2016,2018 by Jonathan Naylor G4KLX
 *
 *   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
@@ -32,7 +32,8 @@ m_hdr(NULL),
 m_ldu1(NULL),
 m_ldu2(NULL),
 m_termlc(NULL),
-m_term(NULL)
+m_term(NULL),
+m_pdu(NULL)
 {
 	CBCH bch;
 
@@ -70,6 +71,13 @@ m_term(NULL)
 	m_term[1U] |= P25_DUID_TERM;
 	bch.encode(m_term);
 	m_term[7U] &= 0xFEU;		// Clear the parity bit
+
+	m_pdu = new unsigned char[P25_NID_LENGTH_BYTES];
+	m_pdu[0U] = (nac >> 4) & 0xFFU;
+	m_pdu[1U] = (nac << 4) & 0xF0U;
+	m_pdu[1U] |= P25_DUID_PDU;
+	bch.encode(m_pdu);
+	m_pdu[7U] &= 0xFEU;		// Clear the parity bit
 }
 
 CP25NID::~CP25NID()
@@ -79,6 +87,7 @@ CP25NID::~CP25NID()
 	delete[] m_ldu2;
 	delete[] m_termlc;
 	delete[] m_term;
+	delete[] m_pdu;
 }
 
 bool CP25NID::decode(const unsigned char* data)
@@ -118,6 +127,12 @@ bool CP25NID::decode(const unsigned char* data)
 		return true;
 	}
 
+	errs = CP25Utils::compare(nid, m_pdu, P25_NID_LENGTH_BYTES);
+	if (errs < MAX_NID_ERRS) {
+		m_duid = P25_DUID_PDU;
+		return true;
+	}
+
 	return false;
 }
 
@@ -141,6 +156,9 @@ void CP25NID::encode(unsigned char* data, unsigned char duid) const
 	case P25_DUID_TERM_LC:
 		CP25Utils::encode(m_termlc, data, 48U, 114U);
 		break;
+	case P25_DUID_PDU:
+		CP25Utils::encode(m_pdu, data, 48U, 114U);
+		break;
 	default:
 		break;
 	}
diff --git a/P25NID.h b/P25NID.h
index 2f2a847..bb0031f 100644
--- a/P25NID.h
+++ b/P25NID.h
@@ -1,5 +1,5 @@
 /*
-*   Copyright (C) 2016 by Jonathan Naylor G4KLX
+*   Copyright (C) 2016,2018 by Jonathan Naylor G4KLX
 *
 *   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
@@ -37,6 +37,7 @@ private:
 	unsigned char* m_ldu2;
 	unsigned char* m_termlc;
 	unsigned char* m_term;
+	unsigned char* m_pdu;
 };
 
 #endif