Voice call improvements: single call limit, hide debug tab, remove speaker toggle

Changes:
- Add CallManager singleton to ensure only 1 call per device at a time
- Hide Debug tab from production (href: null)
- Remove speaker/earpiece toggle button (always use speaker)
- Agent uses voice_ask API (fast ~1 sec latency)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/(tabs)/_layout.tsx

@@ -72,14 +72,11 @@ export default function TabLayout() {
           ),
         }}
       />
-      {/* Debug tab - for testing audio/voice */}
+      {/* Debug tab - hidden in production */}
       <Tabs.Screen
         name="debug"
         options={{
-          title: 'Debug',
-          tabBarIcon: ({ color, size }) => (
-            <Feather name="terminal" size={22} color={color} />
-          ),
+          href: null,
         }}
       />
       {/* Hide explore tab */}

app/voice-call.tsx

@@ -288,19 +288,8 @@ export default function VoiceCallScreen() {
           <Ionicons name="call" size={32} color={AppColors.white} />
         </TouchableOpacity>
 
-        {/* Speaker/Earpiece toggle */}
-        <TouchableOpacity
-          style={[styles.controlButton, isSpeakerOn && styles.controlButtonActive]}
-          onPress={handleToggleSpeaker}
-          disabled={!isActive}
-        >
-          <Ionicons
-            name={isSpeakerOn ? 'volume-high' : 'ear'}
-            size={28}
-            color={isSpeakerOn ? AppColors.success : AppColors.white}
-          />
-          <Text style={styles.controlLabel}>{isSpeakerOn ? 'Speaker' : 'Earpiece'}</Text>
-        </TouchableOpacity>
+        {/* Empty placeholder for layout balance */}
+        <View style={styles.controlButton} />
       </View>
     </SafeAreaView>
   );

hooks/useLiveKitRoom.ts

@@ -26,6 +26,7 @@ import {
   stopAudioSession,
   reconfigureAudioForPlayback,
 } from '@/utils/audioSession';
+import { callManager } from '@/services/callManager';
 
 // Connection states
 export type ConnectionState =
@@ -103,6 +104,7 @@ export function useLiveKitRoom(options: UseLiveKitRoomOptions): UseLiveKitRoomRe
   const connectionIdRef = useRef(0);
   const isUnmountingRef = useRef(false);
   const appStateRef = useRef<AppStateStatus>(AppState.currentState);
+  const callIdRef = useRef<string | null>(null);
 
   // ===================
   // LOGGING FUNCTIONS
@@ -158,10 +160,27 @@ export function useLiveKitRoom(options: UseLiveKitRoomOptions): UseLiveKitRoomRe
     // Prevent multiple concurrent connection attempts
     const currentConnectionId = ++connectionIdRef.current;
 
+    // Generate unique call ID for this session
+    const callId = `call-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
+    callIdRef.current = callId;
+
     logInfo('========== STARTING VOICE CALL ==========');
     logInfo(`User ID: ${userId}`);
     logInfo(`Platform: ${Platform.OS}`);
     logInfo(`Connection ID: ${currentConnectionId}`);
+    logInfo(`Call ID: ${callId}`);
+
+    // Register with CallManager - this will disconnect any existing call
+    logInfo('Registering call with CallManager...');
+    await callManager.registerCall(callId, async () => {
+      logInfo('CallManager requested disconnect (another call starting)');
+      if (roomRef.current) {
+        await roomRef.current.disconnect();
+        roomRef.current = null;
+      }
+      await stopAudioSession();
+    });
+    logSuccess('Call registered with CallManager');
 
     // Check if already connected
     if (roomRef.current) {
@@ -505,6 +524,13 @@ export function useLiveKitRoom(options: UseLiveKitRoomOptions): UseLiveKitRoomRe
     logInfo('========== DISCONNECTING ==========');
     setState('disconnecting');
 
+    // Unregister from CallManager
+    if (callIdRef.current) {
+      logInfo(`Unregistering call: ${callIdRef.current}`);
+      callManager.unregisterCall(callIdRef.current);
+      callIdRef.current = null;
+    }
+
     try {
       if (roomRef.current) {
         logInfo('Disconnecting from room...');
@@ -603,6 +629,12 @@ export function useLiveKitRoom(options: UseLiveKitRoomOptions): UseLiveKitRoomRe
 
       // Cleanup
       const cleanup = async () => {
+        // Unregister from CallManager
+        if (callIdRef.current) {
+          callManager.unregisterCall(callIdRef.current);
+          callIdRef.current = null;
+        }
+
         if (roomRef.current) {
           try {
             await roomRef.current.disconnect();

julia-agent/julia-ai/src/agent.py

@@ -191,9 +191,10 @@ class WellNuoLLM(llm.LLM):
             token = await self._ensure_token()
 
             async with aiohttp.ClientSession() as session:
-                # Using ask_wellnuo_ai instead of voice_ask (same params, same response)
+                # Using voice_ask - MUCH faster than ask_wellnuo_ai (1s vs 27s)
+                # ask_wellnuo_ai has 20x higher latency and causes timeouts
                 data = {
-                    "function": "ask_wellnuo_ai",
+                    "function": "voice_ask",
                     "clientId": "MA_001",
                     "user_name": WELLNUO_USER,
                     "token": token,

services/callManager.ts

@@ -0,0 +1,111 @@
+/**
+ * CallManager - Singleton to manage active voice calls
+ *
+ * Ensures only ONE voice call can be active at a time per device.
+ * If a new call is started while another is active, the old one is disconnected first.
+ *
+ * This addresses the LiveKit concurrent agent jobs limit (5 per project).
+ */
+
+type DisconnectCallback = () => Promise<void>;
+
+class CallManager {
+  private static instance: CallManager;
+  private activeCallId: string | null = null;
+  private disconnectCallback: DisconnectCallback | null = null;
+
+  private constructor() {
+    // Singleton
+  }
+
+  static getInstance(): CallManager {
+    if (!CallManager.instance) {
+      CallManager.instance = new CallManager();
+    }
+    return CallManager.instance;
+  }
+
+  /**
+   * Register a new call. If there's an existing call, disconnect it first.
+   * @param callId Unique ID for this call
+   * @param onDisconnect Callback to disconnect this call
+   * @returns true if this call can proceed
+   */
+  async registerCall(
+    callId: string,
+    onDisconnect: DisconnectCallback
+  ): Promise<boolean> {
+    console.log(`[CallManager] Registering call: ${callId}`);
+
+    // If there's an active call, disconnect it first
+    if (this.activeCallId && this.activeCallId !== callId) {
+      console.log(
+        `[CallManager] Active call exists (${this.activeCallId}), disconnecting...`
+      );
+
+      if (this.disconnectCallback) {
+        try {
+          await this.disconnectCallback();
+          console.log(`[CallManager] Previous call disconnected`);
+        } catch (err) {
+          console.error(`[CallManager] Error disconnecting previous call:`, err);
+        }
+      }
+    }
+
+    // Register the new call
+    this.activeCallId = callId;
+    this.disconnectCallback = onDisconnect;
+    console.log(`[CallManager] Call ${callId} is now active`);
+
+    return true;
+  }
+
+  /**
+   * Unregister a call when it ends
+   * @param callId The call ID to unregister
+   */
+  unregisterCall(callId: string): void {
+    if (this.activeCallId === callId) {
+      console.log(`[CallManager] Unregistering call: ${callId}`);
+      this.activeCallId = null;
+      this.disconnectCallback = null;
+    } else {
+      console.log(
+        `[CallManager] Call ${callId} is not active, ignoring unregister`
+      );
+    }
+  }
+
+  /**
+   * Check if there's an active call
+   */
+  hasActiveCall(): boolean {
+    return this.activeCallId !== null;
+  }
+
+  /**
+   * Get the current active call ID
+   */
+  getActiveCallId(): string | null {
+    return this.activeCallId;
+  }
+
+  /**
+   * Force disconnect the active call (if any)
+   */
+  async forceDisconnect(): Promise<void> {
+    if (this.activeCallId && this.disconnectCallback) {
+      console.log(`[CallManager] Force disconnecting call: ${this.activeCallId}`);
+      try {
+        await this.disconnectCallback();
+      } catch (err) {
+        console.error(`[CallManager] Error force disconnecting:`, err);
+      }
+      this.activeCallId = null;
+      this.disconnectCallback = null;
+    }
+  }
+}
+
+export const callManager = CallManager.getInstance();