ignore subsequent grant demands for a TG with a call in progress;

src/fne/network/callhandler/TagP25Data.cpp

@@ -179,6 +179,12 @@ bool TagP25Data::processFrame(const uint8_t* data, uint32_t len, uint32_t peerId
                 }
 
                 if (std::find_if(m_status.begin(), m_status.end(), [&](StatusMapPair x) { return x.second.dstId == dstId; }) != m_status.end()) {
+                    if (grantDemand) {
+                        LogWarning(LOG_NET, "P25, Call Collision, peer = %u, srcId = %u, dstId = %u, streamId = %u, rxPeer = %u, rxSrcId = %u, rxDstId = %u, rxStreamId = %u, external = %u",
+                            peerId, srcId, dstId, streamId, status.peerId, status.srcId, status.dstId, status.streamId, external);
+                        return false;
+                    }
+                    else {
                         m_status.erase(dstId);
 
                         // is this a parrot talkgroup? if so, clear any remaining frames from the buffer
@@ -212,6 +218,7 @@ bool TagP25Data::processFrame(const uint8_t* data, uint32_t len, uint32_t peerId
                         m_network->m_callInProgress = false;
                     }
                 }
+            }
 
             // is this a new call stream?
             if ((duid != DUID::TDU) && (duid != DUID::TDULC)) {