diff --git a/tests/test_stream_service.c b/tests/test_stream_service.c
index 6838ecc8..8fe9b852 100644
--- a/tests/test_stream_service.c
+++ b/tests/test_stream_service.c
@@ -420,6 +420,14 @@ static void test_network(void) {
     CHECK(stream_publish_open(nodes[3], GROUP1, &parameters, &parallel_publisher) == STREAM_OK);
     struct stream_info parallel_info; CHECK(stream_get_info(parallel_publisher, &parallel_info) == STREAM_OK);
     wait_state(1, 3, GROUP1, parallel_info.descriptor.source_epoch, 0);
+    /* Две независимые публикации одного канала видны через общий каталог; подписчики не становятся источниками. */
+    char *catalog = NULL, origin_id[64], parallel_id[64], subscriber_id[64];
+    CHECK(stream_sources_json(nodes[1], GROUP1, &catalog) == STREAM_OK);
+    snprintf(origin_id, sizeof(origin_id), "\"id\":\"%llu\"", (unsigned long long)nodes[0]->node_id);
+    snprintf(parallel_id, sizeof(parallel_id), "\"id\":\"%llu\"", (unsigned long long)nodes[3]->node_id);
+    snprintf(subscriber_id, sizeof(subscriber_id), "\"id\":\"%llu\"", (unsigned long long)nodes[1]->node_id);
+    CHECK(strstr(catalog, origin_id) && strstr(catalog, parallel_id) && !strstr(catalog, subscriber_id)); u_free(catalog);
+    DEBUG_INFO(DEBUG_CATEGORY_STREAM, "[PASS] shared catalogue exposes two live publishers in the same channel");
     CHECK(stream_subscribe_manual_open(nodes[1], GROUP1, nodes[3]->node_id, &parallel_subscriber) == STREAM_OK);
     size_t accepted = 0;
     CHECK(stream_publish_write(parallel_publisher, expected, sizeof(expected), &accepted) == STREAM_OK && accepted == sizeof(expected));
diff --git a/tools/chatgui-android/libutun_lite/stream_bridge.c b/tools/chatgui-android/libutun_lite/stream_bridge.c
index 9cb32b62..30c9d5b0 100644
--- a/tools/chatgui-android/libutun_lite/stream_bridge.c
+++ b/tools/chatgui-android/libutun_lite/stream_bridge.c
@@ -314,8 +314,11 @@ void android_stream_detach(struct UTUN_INSTANCE *inst) {
 /* Команда содержит идентификаторы, а не borrowed pointer ядра. */
 int android_stream_open(uint64_t id, uint64_t group, uint64_t source, unsigned width, unsigned height,
                         unsigned rotation, int audio, uint64_t expected_epoch) {
-    if (!id || !group || (!source && (!width || width > 4096 || !height || height > 4096 || rotation > 270 || rotation % 90))) {
-        DEBUG_ERROR(DEBUG_CATEGORY_STREAM, "Android stream open invalid arguments"); return -1;
+    if (!id || !group || (source && !expected_epoch)
+        || (!source && (!width || width > 4096 || !height || height > 4096 || rotation > 270 || rotation % 90))) {
+        DEBUG_ERROR(DEBUG_CATEGORY_STREAM, "Android stream open invalid id=%llu group=%llx source=%llx epoch=%llx dimensions=%ux%u",
+                    (unsigned long long)id, (unsigned long long)group, (unsigned long long)source,
+                    (unsigned long long)expected_epoch, width, height); return -1;
     }
     pthread_mutex_lock(&media_lock);
     struct android_media_session *s = source ? &viewer : &publisher;
@@ -407,4 +410,3 @@ uint8_t *android_stream_pull(uint64_t id, size_t *length) {
     }
     pthread_mutex_unlock(&media_lock); return data;
 }
-
diff --git a/tools/chatgui-android/libutun_lite/stream_bridge.h b/tools/chatgui-android/libutun_lite/stream_bridge.h
index 255de96b..d7dc2278 100644
--- a/tools/chatgui-android/libutun_lite/stream_bridge.h
+++ b/tools/chatgui-android/libutun_lite/stream_bridge.h
@@ -3,7 +3,7 @@
  * Один publisher и один viewer, TX <=2MB/128 records, RX <=4MB/256 records.
  * Data принимает полные H.264 Annex B кадры (KEY содержит SPS/PPS/IDR) и Opus 48k mono/20ms.
  * pull передаёт владение u_malloc-буфером: kind:1,flags:1,width:2,height:2,rotation:2,PTS_us:8,length:4,data.
- * kinds: video=1,audio=2,gap=3,opened=4,ended=5,error=6. Числа big-endian.
+ * kinds: video=1,audio=2,gap=3,opened=4,ended=5,error=6; error.flags = stream_close_reason. Числа big-endian.
  * Медиаданные передаются через pull, не через общий чатовый event bus. */
 #ifndef ANDROID_STREAM_BRIDGE_H
 #define ANDROID_STREAM_BRIDGE_H
@@ -15,11 +15,11 @@ struct UTUN_INSTANCE;
 /* 0 attached, -1 invalid/busy: нельзя передать singleton другому ядру до detach старого. */
 int android_stream_attach(struct UTUN_INSTANCE *inst);
 void android_stream_detach(struct UTUN_INSTANCE *inst);
+/* source=0 — publisher; source!=0 — viewer с обязательным expected_epoch. Команда принята=0, результат через pull. */
 int android_stream_open(uint64_t id, uint64_t group, uint64_t source, unsigned width, unsigned height,
                         unsigned rotation, int audio, uint64_t expected_epoch);
 /* Наблюдение выбранного канала через CHAT_EVT_STREAM_SOURCES; group=0 снимает его. */
 int android_stream_watch(uint64_t group);
-/* source=0 — publisher; source!=0 — viewer. 0 означает, что команда принята, результат приходит через pull. */
 int android_stream_feed(uint64_t id, int video, uint64_t pts, int key, const uint8_t *data, size_t length);
 /* feed: 1 accepted, 0 dropped (video: запросить KEY), -1 detached/stopped/invalid. */
 void android_stream_stop(uint64_t id);