diff --git a/src/commands/projects/voice-advanced/commands.test.ts b/src/commands/projects/voice-advanced/commands.test.ts
index b13d318..179f062 100644
--- a/src/commands/projects/voice-advanced/commands.test.ts
+++ b/src/commands/projects/voice-advanced/commands.test.ts
@@ -46,7 +46,9 @@ describe("projects voice-advanced commands", () => {
 
   it("lists every canonical voice-advanced key", () => {
     expect(VOICE_ADVANCED_SETTING_KEYS).toContain("noiseSuppression.enabled");
-    expect(VOICE_ADVANCED_SETTING_KEYS).toHaveLength(22);
+    expect(VOICE_ADVANCED_SETTING_KEYS).toContain("languageId.enabled");
+    expect(VOICE_ADVANCED_SETTING_KEYS).toContain("languageId.minSpeechMs");
+    expect(VOICE_ADVANCED_SETTING_KEYS).toHaveLength(24);
   });
 
   it("lists resolved advanced settings", async () => {
diff --git a/src/commands/projects/voice-advanced/defs.ts b/src/commands/projects/voice-advanced/defs.ts
index fcfcafd..53fa0b8 100644
--- a/src/commands/projects/voice-advanced/defs.ts
+++ b/src/commands/projects/voice-advanced/defs.ts
@@ -20,6 +20,8 @@ export const VOICE_ADVANCED_SETTING_KEYS = [
   "tts.speed",
   "tts.postUtteranceSilenceMs",
   "noiseSuppression.enabled",
+  "languageId.enabled",
+  "languageId.minSpeechMs",
   "events.mode",
 ] as const;
 
@@ -169,6 +171,20 @@ export const VOICE_ADVANCED_SETTING_DEFS: Record<
     description:
       "Applies Xiph RNNoise to inbound PCM before VAD and STT on voice runners.",
   },
+  "languageId.enabled": {
+    type: "boolean",
+    default: true,
+    description:
+      "Enable spoken language identification (Sherpa Whisper tiny) on voice deploys.",
+  },
+  "languageId.minSpeechMs": {
+    type: "number",
+    default: 2500,
+    min: 1000,
+    max: 5000,
+    description:
+      "Minimum inbound PCM (ms) before first spoken-language identify per utterance (cloud default 2500).",
+  },
   "events.mode": {
     type: "string",
     default: "both",
diff --git a/src/lib/api.ts b/src/lib/api.ts
index 97ede43..cad1dad 100644
--- a/src/lib/api.ts
+++ b/src/lib/api.ts
@@ -291,7 +291,9 @@ export type VoiceAdvancedSettingKey =
   | "tts.speed"
   | "tts.postUtteranceSilenceMs"
   | "events.mode"
-  | "noiseSuppression.enabled";
+  | "noiseSuppression.enabled"
+  | "languageId.enabled"
+  | "languageId.minSpeechMs";
 
 export interface ProjectVoiceAdvancedSettingsResponse {
   project_id: string;