diff --git a/tests/test_db_sync.c b/tests/test_db_sync.c
index 2f84cd33..30af5bf3 100644
--- a/tests/test_db_sync.c
+++ b/tests/test_db_sync.c
@@ -337,6 +337,41 @@ int main(void) {
     printf("  PASS\n");
 
     // ===================================================================
+    // Phase 5b: ссылка ответа проходит реальный PUSH и разрешается на обоих узлах.
+    printf("Phase 5b: signed reply reference over PUSH\n");
+    {
+        sqlite3_stmt* st = NULL; char original[65], json[256];
+        if (sqlite3_prepare_v2(inst_a->topo_sqlite_db,
+            "SELECT lower(hex(message_id)) FROM push_t ORDER BY timestamp LIMIT 1", -1, &st, NULL) != SQLITE_OK
+            || sqlite3_step(st) != SQLITE_ROW) {
+            DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "reply test: original lookup failed");
+            sqlite3_finalize(st); test_phase = 2; goto done;
+        }
+        snprintf(original, sizeof(original), "%s", sqlite3_column_text(st, 0)); sqlite3_finalize(st);
+        snprintf(json, sizeof(json), "{\"ct\":\"text/plain\",\"d\":\"Answer\",\"reply_to\":\"%s\"}", original);
+        uint64_t ts = db_sync_next_timestamp(si_a); uint8_t body[264], signature[64];
+        memcpy(body, &ts, 8); memcpy(body + 8, json, strlen(json));
+        if (sc_ed25519_sign(inst_a->my_ed25519_privkey, body, 8 + strlen(json), signature) != SC_OK
+            || db_sync_insert_signed(si_a, json, strlen(json), signature, 64, ts, NULL) != 0) {
+            DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "reply test: signed submission failed"); test_phase = 2; goto done;
+        }
+        ca_target = cb_target = 4;
+        if (!wait_for("reply PUSH", _cond_both_count, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
+        struct UTUN_INSTANCE* peers[] = {inst_a, inst_b};
+        for (unsigned i = 0; i < 2; i++) {
+            const char* sql = "SELECT count(*) FROM push_t r JOIN push_t o ON "
+                "lower(hex(o.message_id))=json_extract(CAST(r.data AS TEXT),'$.reply_to')";
+            st = NULL;
+            if (sqlite3_prepare_v2(peers[i]->topo_sqlite_db, sql, -1, &st, NULL) != SQLITE_OK
+                || sqlite3_step(st) != SQLITE_ROW || sqlite3_column_int(st, 0) != 1) {
+                DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "reply test: reference unresolved peer=%u", i);
+                sqlite3_finalize(st); test_phase = 2; goto done;
+            }
+            sqlite3_finalize(st);
+        }
+    }
+    printf("  signed reply resolves on sender and receiver PASS\n");
+
     // Phase 6: triple star — cascade notification.
     // ===================================================================
     printf("Phase 6: triple star\n");