diff --git a/viewsh-module-iot/viewsh-module-iot-gateway/src/main/java/com/viewsh/module/iot/gateway/codec/jt808/IotJt808DeviceMessageCodec.java b/viewsh-module-iot/viewsh-module-iot-gateway/src/main/java/com/viewsh/module/iot/gateway/codec/jt808/IotJt808DeviceMessageCodec.java
index 5129ae3..e01c9fd 100644
--- a/viewsh-module-iot/viewsh-module-iot-gateway/src/main/java/com/viewsh/module/iot/gateway/codec/jt808/IotJt808DeviceMessageCodec.java
+++ b/viewsh-module-iot/viewsh-module-iot-gateway/src/main/java/com/viewsh/module/iot/gateway/codec/jt808/IotJt808DeviceMessageCodec.java
@@ -443,12 +443,20 @@ public class IotJt808DeviceMessageCodec implements IotDeviceMessageCodec {
             case "TTS" -> {
                 // 语音播报服务 -> JT808 文本信息下发 (0x8300)
                 String ttsText = (String) serviceParams.getOrDefault("tts_text", "");
-                int ttsFlag = ((Number) serviceParams.getOrDefault("tts_flag", 4)).intValue(); // 默认 4-TTS 播读
-
-                log.info("[encodeServiceInvoke][TTS 语音播报] phone={}, flag={}, text={}", phone, ttsFlag, ttsText);
+                int ttsFlag = ((Number) serviceParams.getOrDefault("tts_flag", 0x08)).intValue();
+                log.info("[encodeServiceInvoke][TTS 语音播报] phone={}, flag=0x{}, text={}",
+                        phone, Integer.toHexString(ttsFlag), ttsText);
                 yield encoder.encodeTextInfoDown(phone, (byte) ttsFlag, ttsText, flowId);
             }
 
+            case "instruction_config" -> {
+                // 服务指令配置 -> JT808 文本信息下发 (0x8300), 静默执行
+                // 异步调用，设备收到后解析指令，修改参数，回复 0x0001，但不发声
+                String config = (String) serviceParams.getOrDefault("config", "");
+                log.info("[encodeServiceInvoke][服务指令配置] phone={}, config={}", phone, config);
+                yield encoder.encodeTextInfoDown(phone, (byte) 0x01, config, flowId);
+            }
+
             case "locationQuery" -> {
                 // 位置查询服务 -> JT808 位置信息查询 (0x8201)
                 log.info("[encodeServiceInvoke][位置查询] phone={}", phone);