diff --git a/src/call/call.c b/src/call/call.c
index a8f6db23..2a13ee76 100644
--- a/src/call/call.c
+++ b/src/call/call.c
@@ -15,6 +15,7 @@
 #include "call_priv.h"
 #include "call_video_transport.h"
 #include "call_proto.h"
+#include "../radio/radio_call.h"
 #include "../dm/dm_core.h"
 #include "../utun_instance.h"
 #include "../chat/chat_event.h"
@@ -538,6 +539,12 @@ static void call_handle_invite(struct call_ctx* ctx, uint64_t from, uint64_t gro
         return;
     }
 
+    if (radio_call_busy(ctx->inst)) {
+        struct call_pkt_busy busy = {CALL_SUBCMD_BUSY, call_id};
+        DEBUG_INFO(DEBUG_CATEGORY_CALL, "call busy: pending radio invitation id=%016llx", (unsigned long long)call_id);
+        call_send(ctx, group, from, (const uint8_t*)&busy, sizeof(busy), ROUTE_CRYPTO_SIGN | ROUTE_CRYPTO_ENCRYPT);
+        return;
+    }
     /* занятость: есть другая активная сессия */
     struct ll_entry* e = ctx->sessions ? ctx->sessions->head : NULL;
     while (e) {
@@ -838,6 +845,13 @@ void call_destroy(struct UTUN_INSTANCE* inst) {
     DEBUG_INFO(DEBUG_CATEGORY_CALL, "%s: destroyed (started=%u ended=%u)", CALL_ID, started, ended);
 }
 
+int call_busy(struct UTUN_INSTANCE* inst) {
+    struct call_ctx* ctx = call_of(inst);
+    for (struct ll_entry* e = ctx && ctx->sessions ? ctx->sessions->head : NULL; e; e = e->next)
+        if (((struct call_session*)e->data)->state != CALL_ST_ENDED) return 1;
+    return 0;
+}
+
 int call_is_online(struct UTUN_INSTANCE* inst, const char* ch_id, uint64_t peer_node_id) {
     if (!inst || !ch_id || !ch_id[0] || !inst->topo_groups) return 0;
     if (peer_node_id == inst->node_id) return 1;
@@ -957,6 +971,11 @@ void call_start(struct UTUN_INSTANCE* inst, const char* ch_id, uint64_t peer_nod
         DEBUG_WARN(DEBUG_CATEGORY_CALL, "%s: call_start self-call rejected", CALL_ID);
         return;
     }
+    if (radio_call_busy(inst)) {
+        DEBUG_INFO(DEBUG_CATEGORY_CALL, "call start rejected: pending radio invitation");
+        call_event_id(ctx, CHAT_EVT_CALL_ENDED, out_call_id, CALL_REASON_BUSY);
+        return;
+    }
 
     uint64_t group_id = 0;
     char route_ch[64];
diff --git a/src/call/call.h b/src/call/call.h
index ce28b5fe..32437200 100644
--- a/src/call/call.h
+++ b/src/call/call.h
@@ -35,6 +35,8 @@ void call_start  (struct UTUN_INSTANCE* inst, const char* ch_id, uint64_t peer_n
 void call_accept (struct UTUN_INSTANCE* inst, uint64_t call_id);
 void call_decline(struct UTUN_INSTANCE* inst, uint64_t call_id);
 void call_hangup (struct UTUN_INSTANCE* inst, uint64_t call_id);
+/* Проверка занятости обычным звонком; только uasync, включая входящий/исходящий. */
+int call_busy(struct UTUN_INSTANCE* inst);
 
 /* Read-only онлайн-проверка (GUI может звать из любого потока). */
 int  call_is_online(struct UTUN_INSTANCE* inst, const char* ch_id, uint64_t peer_node_id);