diff --git a/src/host/dmr/packet/ControlSignaling.cpp b/src/host/dmr/packet/ControlSignaling.cpp
index d61836d9..bf268d93 100644
--- a/src/host/dmr/packet/ControlSignaling.cpp
+++ b/src/host/dmr/packet/ControlSignaling.cpp
@@ -221,7 +221,8 @@ bool ControlSignaling::process(uint8_t* data, uint32_t len)
                     if (m_slot->m_authoritative) {
                         writeRF_CSBK_Grant(srcId, dstId, isp->getServiceOptions(), false);
                     } else {
-                        m_slot->m_network->writeGrantReq(modem::DVM_STATE::STATE_DMR, srcId, dstId, m_slot->m_slotNo, true);
+                        if (m_slot->m_network != nullptr)
+                            m_slot->m_network->writeGrantReq(modem::DVM_STATE::STATE_DMR, srcId, dstId, m_slot->m_slotNo, true);
                     }
                     break;
                 case SVC_KIND_GRP_VOICE_CALL:
@@ -239,7 +240,8 @@ bool ControlSignaling::process(uint8_t* data, uint32_t len)
                     if (m_slot->m_authoritative) {
                         writeRF_CSBK_Grant(srcId, dstId, isp->getServiceOptions(), true);
                     } else {
-                        m_slot->m_network->writeGrantReq(modem::DVM_STATE::STATE_DMR, srcId, dstId, m_slot->m_slotNo, false);
+                        if (m_slot->m_network != nullptr)
+                            m_slot->m_network->writeGrantReq(modem::DVM_STATE::STATE_DMR, srcId, dstId, m_slot->m_slotNo, false);
                     }
                     break;
                 case SVC_KIND_IND_DATA_CALL:
@@ -1355,7 +1357,8 @@ void ControlSignaling::writeRF_CSBK_U_Reg_Rsp(uint32_t srcId, uint8_t serviceOpt
         // remove dynamic unit registration table entry
         m_slot->m_affiliations->unitDereg(srcId);
 
-        m_slot->m_network->announceUnitDeregistration(srcId);
+        if (m_slot->m_network != nullptr)
+            m_slot->m_network->announceUnitDeregistration(srcId);
 
         csbk->setReason(TS_ACK_RSN_REG);
     }
@@ -1382,7 +1385,8 @@ void ControlSignaling::writeRF_CSBK_U_Reg_Rsp(uint32_t srcId, uint8_t serviceOpt
                 m_slot->m_affiliations->unitReg(srcId);
             }
 
-            m_slot->m_network->announceUnitRegistration(srcId);
+            if (m_slot->m_network != nullptr)
+                m_slot->m_network->announceUnitRegistration(srcId);
         }
     }
 
diff --git a/src/host/nxdn/packet/ControlSignaling.cpp b/src/host/nxdn/packet/ControlSignaling.cpp
index 2c2aee81..9a6a711e 100644
--- a/src/host/nxdn/packet/ControlSignaling.cpp
+++ b/src/host/nxdn/packet/ControlSignaling.cpp
@@ -187,7 +187,8 @@ bool ControlSignaling::process(uint8_t fct, uint8_t option, uint8_t* data, uint3
             if (m_nxdn->m_authoritative) {
                 writeRF_Message_Grant(srcId, dstId, serviceOptions, true);
             } else {
-                m_nxdn->m_network->writeGrantReq(modem::DVM_STATE::STATE_NXDN, srcId, dstId, 0U, false);
+                if (m_nxdn->m_network != nullptr)
+                    m_nxdn->m_network->writeGrantReq(modem::DVM_STATE::STATE_NXDN, srcId, dstId, 0U, false);
             }
         }
         break;
@@ -724,7 +725,8 @@ bool ControlSignaling::writeRF_Message_Grp_Reg_Rsp(uint32_t srcId, uint32_t dstI
         // update dynamic affiliation table
         m_nxdn->m_affiliations.groupAff(srcId, dstId);
 
-        m_nxdn->m_network->announceGroupAffiliation(srcId, dstId);
+        if (m_nxdn->m_network != nullptr)
+            m_nxdn->m_network->announceGroupAffiliation(srcId, dstId);
     }
 
     writeRF_Message_Imm(rcch.get(), false);
@@ -767,7 +769,8 @@ void ControlSignaling::writeRF_Message_U_Reg_Rsp(uint32_t srcId, uint32_t locId)
             m_nxdn->m_affiliations.unitReg(srcId);
         }
 
-        m_nxdn->m_network->announceUnitRegistration(srcId);
+        if (m_nxdn->m_network != nullptr)
+            m_nxdn->m_network->announceUnitRegistration(srcId);
     }
 
     rcch->setSrcId(srcId);
diff --git a/src/host/p25/packet/ControlSignaling.cpp b/src/host/p25/packet/ControlSignaling.cpp
index a79d5e7f..086c8cce 100644
--- a/src/host/p25/packet/ControlSignaling.cpp
+++ b/src/host/p25/packet/ControlSignaling.cpp
@@ -242,7 +242,8 @@ bool ControlSignaling::process(uint8_t* data, uint32_t len, std::unique_ptr<lc::
 
                     writeRF_TSDU_Grant(srcId, dstId, serviceOptions, true);
                 } else {
-                    m_p25->m_network->writeGrantReq(modem::DVM_STATE::STATE_P25, srcId, dstId, 0U, false);
+                    if (m_p25->m_network != nullptr)
+                        m_p25->m_network->writeGrantReq(modem::DVM_STATE::STATE_P25, srcId, dstId, 0U, false);
                 }
             }
             break;
@@ -272,7 +273,8 @@ bool ControlSignaling::process(uint8_t* data, uint32_t len, std::unique_ptr<lc::
 
                         writeRF_TSDU_Grant(srcId, dstId, serviceOptions, false);
                     } else {
-                        m_p25->m_network->writeGrantReq(modem::DVM_STATE::STATE_P25, srcId, dstId, 0U, true);
+                        if (m_p25->m_network != nullptr)
+                            m_p25->m_network->writeGrantReq(modem::DVM_STATE::STATE_P25, srcId, dstId, 0U, true);
                     }
                 }
             }
@@ -302,7 +304,8 @@ bool ControlSignaling::process(uint8_t* data, uint32_t len, std::unique_ptr<lc::
 
                         writeRF_TSDU_Grant(srcId, dstId, serviceOptions, false);
                     } else {
-                        m_p25->m_network->writeGrantReq(modem::DVM_STATE::STATE_P25, srcId, dstId, 0U, true);
+                        if (m_p25->m_network != nullptr)
+                            m_p25->m_network->writeGrantReq(modem::DVM_STATE::STATE_P25, srcId, dstId, 0U, true);
                     }
                 }
                 else if (iosp->getResponse() == P25_ANS_RSP_DENY) {
@@ -2685,7 +2688,8 @@ bool ControlSignaling::writeRF_TSDU_Grp_Aff_Rsp(uint32_t srcId, uint32_t dstId)
         // update dynamic affiliation table
         m_p25->m_affiliations.groupAff(srcId, dstId);
 
-        m_p25->m_network->announceGroupAffiliation(srcId, dstId);
+        if (m_p25->m_network != nullptr)
+            m_p25->m_network->announceGroupAffiliation(srcId, dstId);
     }
 
     writeRF_TSDU_SBF_Imm(iosp.get(), noNet);
@@ -2731,7 +2735,8 @@ void ControlSignaling::writeRF_TSDU_U_Reg_Rsp(uint32_t srcId, uint32_t sysId)
             m_p25->m_affiliations.unitReg(srcId);
         }
 
-        m_p25->m_network->announceUnitRegistration(srcId);
+        if (m_p25->m_network != nullptr)
+            m_p25->m_network->announceUnitRegistration(srcId);
     }
 
     writeRF_TSDU_SBF_Imm(iosp.get(), true);
@@ -2767,7 +2772,8 @@ void ControlSignaling::writeRF_TSDU_U_Dereg_Ack(uint32_t srcId)
 
         writeRF_TSDU_SBF_Imm(osp.get(), false);
 
-        m_p25->m_network->announceUnitDeregistration(srcId);
+        if (m_p25->m_network != nullptr)
+            m_p25->m_network->announceUnitDeregistration(srcId);
     }
 }
 
diff --git a/src/host/p25/packet/Voice.cpp b/src/host/p25/packet/Voice.cpp
index 8b44520f..4a56e57c 100644
--- a/src/host/p25/packet/Voice.cpp
+++ b/src/host/p25/packet/Voice.cpp
@@ -365,10 +365,12 @@ bool Voice::process(uint8_t* data, uint32_t len)
             }
 
             // send network grant demand TDU
-            if (!m_p25->m_enableControl && m_p25->m_convNetGrantDemand) {
-                uint8_t controlByte = 0x80U + ((group) ? 0x00U : 0x01U);
-                LogMessage(LOG_RF, P25_HDU_STR " remote grant demand, srcId = %u, dstId = %u", srcId, dstId);
-                m_p25->m_network->writeP25TDU(lc, m_rfLSD, controlByte);
+            if (m_p25->m_network != nullptr) {
+                if (!m_p25->m_enableControl && m_p25->m_convNetGrantDemand) {
+                    uint8_t controlByte = 0x80U + ((group) ? 0x00U : 0x01U);
+                    LogMessage(LOG_RF, P25_HDU_STR " remote grant demand, srcId = %u, dstId = %u", srcId, dstId);
+                    m_p25->m_network->writeP25TDU(lc, m_rfLSD, controlByte);
+                }
             }
 
             m_rfLC = lc;