reject U2U voice channel grant for P25, DMR and NXDN if the unit being called isn't registered;

src/host/dmr/packet/ControlSignaling.cpp

@@ -868,6 +868,14 @@ bool ControlSignaling::writeRF_CSBK_Grant(uint32_t srcId, uint32_t dstId, uint8_
                 }
             }
 
+            if (!grp && !m_tscc->m_ignoreAffiliationCheck) {
+                // is this the target registered?
+                if (!m_tscc->m_affiliations->isUnitReg(dstId)) {
+                    LogWarning(LOG_RF, "DMR Slot %u, CSBK, RAND (Random Access, IND_VOICE_CALL (Individual Voice Call) ignored, no unit registration, dstId = %u", m_tscc->m_slotNo, dstId);
+                    return false;
+                }
+            }
+
             uint32_t availChNo = m_tscc->m_affiliations->getAvailableChannelForSlot(slot);
             if (!m_tscc->m_affiliations->rfCh()->isRFChAvailable() || availChNo == 0U) {
                 if (grp) {

src/host/nxdn/packet/ControlSignaling.cpp

@@ -479,6 +479,14 @@ bool ControlSignaling::writeRF_Message_Grant(uint32_t srcId, uint32_t dstId, uin
                 }
             }
 
+            if (!grp && !m_nxdn->m_ignoreAffiliationCheck) {
+                // is this the target registered?
+                if (!m_nxdn->m_affiliations.isUnitReg(dstId)) {
+                    LogWarning(LOG_RF, "NXDN, %s ignored, no unit registration, dstId = %u", rcch->toString().c_str(), dstId);
+                    return false;
+                }
+            }
+
             if (!m_nxdn->m_affiliations.rfCh()->isRFChAvailable()) {
                 if (grp) {
                     if (!net) {

src/host/p25/packet/ControlSignaling.cpp

@@ -2200,6 +2200,14 @@ bool ControlSignaling::writeRF_TSDU_Grant(uint32_t srcId, uint32_t dstId, uint8_
                 }
             }
 
+            if (!grp && !m_p25->m_ignoreAffiliationCheck) {
+                // is this the target registered?
+                if (!m_p25->m_affiliations.isUnitReg(dstId)) {
+                    LogWarning(LOG_NET, P25_TSDU_STR ", TSBKO, IOSP_UU_VCH (Unit-to-Unit Voice Channel Request) ignored, no unit registration, dstId = %u", dstId);
+                    return false;
+                }
+            }
+
             if (!m_p25->m_affiliations.rfCh()->isRFChAvailable()) {
                 if (grp) {
                     if (!net) {