diff --git a/dmr/Control.cpp b/dmr/Control.cpp
index f5ebbf64..79d68711 100644
--- a/dmr/Control.cpp
+++ b/dmr/Control.cpp
@@ -323,6 +323,25 @@ void Control::clock()
     m_slot2->clock();
 }
 
+/// <summary>
+/// Helper to return the slot carrying the TSCC.
+/// </summary>
+/// <returns>Pointer to the TSCC slot instance.</returns>
+Slot* Control::getTSCCSlot() const
+{
+    switch (m_tsccSlotNo) {
+    case 1U:
+        return m_slot1;
+        break;
+    case 2U:
+        return m_slot2;
+        break;
+    default:
+        LogError(LOG_NET, "DMR, invalid slot, TSCC disabled, slotNo = %u", m_tsccSlotNo);
+        return NULL;
+    }
+}
+
 /// <summary>
 /// Helper to write a DMR extended function packet on the RF interface.
 /// </summary>
@@ -399,26 +418,3 @@ void Control::setCSBKVerbose(bool verbose)
     m_slot1->setCSBKVerbose(verbose);
     m_slot2->setCSBKVerbose(verbose);
 }
-
-// ---------------------------------------------------------------------------
-//  Private Class Members
-// ---------------------------------------------------------------------------
-
-/// <summary>
-/// Helper to return the slot carrying the TSCC.
-/// </summary>
-/// <returns>Pointer to the TSCC slot instance.</returns>
-Slot* Control::getTSCCSlot() const
-{
-    switch (m_tsccSlotNo) {
-    case 1U:
-        return m_slot1;
-        break;
-    case 2U:
-        return m_slot2;
-        break;
-    default:
-        LogError(LOG_NET, "DMR, invalid slot, TSCC disabled, slotNo = %u", m_tsccSlotNo);
-        return NULL;
-    }
-}
diff --git a/dmr/Control.h b/dmr/Control.h
index 9cbea67e..102654f4 100644
--- a/dmr/Control.h
+++ b/dmr/Control.h
@@ -90,6 +90,9 @@ namespace dmr
         /// <summary>Updates the processor.</summary>
         void clock();
 
+        /// <summary>Helper to return the slot carrying the TSCC.</summary>
+        Slot* getTSCCSlot() const;
+
         /// <summary>Helper to write a DMR extended function packet on the RF interface.</summary>
         void writeRF_Ext_Func(uint32_t slotNo, uint32_t func, uint32_t arg, uint32_t dstId);
         /// <summary>Helper to write a DMR call alert packet on the RF interface.</summary>
@@ -111,7 +114,6 @@ namespace dmr
 
     private:
         friend class Slot;
-        friend class packet::ControlSignaling;
 
         uint32_t m_colorCode;
 
@@ -132,9 +134,6 @@ namespace dmr
         bool m_dumpCSBKData;
         bool m_verbose;
         bool m_debug;
-
-        /// <summary>Helper to return the slot carrying the TSCC.</summary>
-        Slot* getTSCCSlot() const;
     };
 } // namespace dmr
 
diff --git a/dmr/Slot.cpp b/dmr/Slot.cpp
index a6199857..57078c97 100644
--- a/dmr/Slot.cpp
+++ b/dmr/Slot.cpp
@@ -203,6 +203,14 @@ bool Slot::processFrame(uint8_t *data, uint32_t len)
         LogMessage(LOG_RF, "DMR Slot %u, total frames: %d, total bits: %d, errors: %d, BER: %.4f%%", 
             m_slotNo, m_rfFrames, m_rfBits, m_rfErrs, float(m_rfErrs * 100U) / float(m_rfBits));
 
+        // release trunked grant (if necessary)
+        Slot *m_tscc = m_dmr->getTSCCSlot();
+        if (m_tscc != NULL) {
+            if (m_tscc->m_enableTSCC && m_rfLC != NULL) {
+                m_tscc->m_affiliations->releaseGrant(m_rfLC->getDstId(), false);
+            }
+        }
+
         if (m_rfTimeout) {
             writeEndRF();
             return false;
diff --git a/dmr/packet/Data.cpp b/dmr/packet/Data.cpp
index bc8b9a28..630da83b 100644
--- a/dmr/packet/Data.cpp
+++ b/dmr/packet/Data.cpp
@@ -116,6 +116,14 @@ bool Data::process(uint8_t* data, uint32_t len)
             LogMessage(LOG_RF, DMR_DT_TERMINATOR_WITH_LC ", slot = %u, dstId = %u", m_slot->m_slotNo, m_slot->m_rfLC->getDstId());
         }
 
+        // release trunked grant (if necessary)
+        Slot *m_tscc = m_slot->m_dmr->getTSCCSlot();
+        if (m_tscc != NULL) {
+            if (m_tscc->m_enableTSCC) {
+                m_tscc->m_affiliations->releaseGrant(m_slot->m_rfLC->getDstId(), false);
+            }
+        }
+
         if (m_slot->m_rssi != 0U) {
             ::ActivityLog("DMR", true, "Slot %u RF end of voice transmission, %.1f seconds, BER: %.1f%%, RSSI: -%u/-%u/-%u dBm",
                 m_slot->m_slotNo, float(m_slot->m_rfFrames) / 16.667F, float(m_slot->m_rfErrs * 100U) / float(m_slot->m_rfBits),