diff --git a/p25/P25Defines.h b/p25/P25Defines.h
index 1b81171..87e097b 100644
--- a/p25/P25Defines.h
+++ b/p25/P25Defines.h
@@ -93,7 +93,9 @@ namespace p25
     const uint8_t   P25_DUID_HDU = 0x00U;               // Header Data Unit
     const uint8_t   P25_DUID_TDU = 0x03U;               // Simple Terminator Data Unit
     const uint8_t   P25_DUID_LDU1 = 0x05U;              // Logical Link Data Unit 1
+    const uint8_t   P25_DUID_VSELP1 = 0x06U;            // Motorola VSELP 1
     const uint8_t   P25_DUID_TSDU = 0x07U;              // Trunking System Data Unit
+    const uint8_t   P25_DUID_VSELP2 = 0x09U;            // Motorola VSELP 2
     const uint8_t   P25_DUID_LDU2 = 0x0AU;              // Logical Link Data Unit 2
     const uint8_t   P25_DUID_PDU = 0x0CU;               // Packet Data Unit 
     const uint8_t   P25_DUID_TDULC = 0x0FU;             // Terminator Data Unit with Link Control
diff --git a/p25/P25RX.cpp b/p25/P25RX.cpp
index 69b82ac..984fbac 100644
--- a/p25/P25RX.cpp
+++ b/p25/P25RX.cpp
@@ -152,6 +152,7 @@ void P25RX::processBit(bool bit)
                 }
                 break;
             case P25_DUID_LDU1:
+            case P25_DUID_VSELP1:
                 m_state = P25RXS_VOICE;
                 m_endPtr = P25_LDU_FRAME_LENGTH_BITS;
                 return;
@@ -162,6 +163,7 @@ void P25RX::processBit(bool bit)
                 }
                 break;
             case P25_DUID_LDU2:
+            case P25_DUID_VSELP2:
                 m_state = P25RXS_VOICE;
                 m_endPtr = P25_LDU_FRAME_LENGTH_BITS;
                 return;