React Native Softphone SDK

A robust TypeScript SDK for integrating FreJun VoIP softphone capabilities into React Native applications.

🌟 Features

• VoIP Calling: Built on sip.js and react-native-webrtc for high-quality audio calls.
• Flexible Auth: Support for Standard Browser OAuth and Direct Code Exchange.
• Secure Auth: OAuth2 flow with Automatic Token Refresh (handles 401 Unauthorized automatically).
• Resilience: Auto-reconnection logic when the app comes to the foreground.
• Call Forking Support: Intelligently handles duplicate SIP invites to prevent "Ghost Hangups".
• Multiple Caller IDs: Fetch and switch between available Virtual Numbers from the user profile.
• Encrypted Storage: Securely persists session tokens.

📦 Installation

1. Install the SDK:

   npm install react-native-softphone-sdk
   # or
   yarn add react-native-softphone-sdk

2. Install Peer Dependencies: You must install these native modules in your project:

   npm install react-native-webrtc react-native-encrypted-storage google-libphonenumber jwt-decode sip.js buffer events

3. iOS Installation:

   cd ios && pod install && cd ..

⚙️ Platform Configuration

Android Setup

1. Permissions (AndroidManifest.xml): Add the following permissions. Note the Bluetooth permissions required for Android 12+ (API 31).

   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.RECORD_AUDIO" />
   <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
   <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
       
   <!-- Android 12+ Bluetooth Requirements -->
   <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />

2. Deep Linking (OAuth Redirect): Required only if using Standard Browser Login. Add this intent filter inside your <activity> tag.

   <intent-filter>
       <action android:name="android.intent.action.VIEW" />
       <category android:name="android.intent.category.DEFAULT" />
       <category android:name="android.intent.category.BROWSABLE" />
       <!-- Replace 'frejun' with your specific scheme -->
       <data android:scheme="frejun" /> 
   </intent-filter>

iOS Setup

1. Info.plist: Add the Microphone usage description.

   <key>NSMicrophoneUsageDescription</key>
   <string>We need access to your microphone to make VoIP calls.</string>

2. Background Modes: Enable "Audio, AirPlay, and Picture in Picture" and "Voice over IP" in Xcode Project Capabilities.

🚀 Usage Guide

1. Initialization

Initialize the SDK once, preferably in your App's root component.

import { Softphone } from 'react-native-softphone-sdk';

const CREDENTIALS = {
    clientId: 'YOUR_CLIENT_ID',
    clientSecret: 'YOUR_CLIENT_SECRET',
};

// ... inside useEffect
const init = async () => {
    // Restore session from storage
    const restoredSoftphone = await Softphone.initialize(CREDENTIALS);
    if (restoredSoftphone) {
        setSoftphone(restoredSoftphone); 
    }
};
init();

2. Authentication (Login)

You have two options for logging in users.

Option A: Standard Browser Flow

Use this if you want the SDK to open the system browser for FreJun login.

import { Linking } from 'react-native';

const handleLogin = async () => {
    // 1. Opens Browser
    await Softphone.login(); 
};

// 2. Handle Redirect (Deep Link)
useEffect(() => {
    const sub = Linking.addEventListener('url', async (event) => {
        if (event.url.includes('?code=')) {
            try {
                // Exchange code for token
                const softphoneInstance = await Softphone.handleRedirect(event.url);
                setSoftphone(softphoneInstance);
            } catch (e) {
                console.error("Login failed", e);
            }
        }
    });
    return () => sub.remove();
}, []);

Option B: Direct Login (Custom Integration)

Use this if you have already obtained an Authorization Code or tokens via your own API or WebView and want to initialize the SDK directly.

const handleDirectLogin = async () => {
    try {
        // Pass credentials (accessToken, email, refreshToken) directly
        // Note: refreshToken is mandatory to ensure session continuity
        const softphoneInstance = await Softphone.login({ 
            accessToken: "YOUR_ACCESS_TOKEN", 
            email: "[email protected]",
            refreshToken: "YOUR_REFRESH_TOKEN",
            // Optional: Provide these to enable auto-refresh if the accessToken is already expired
            clientId: "YOUR_CLIENT_ID",
            clientSecret: "YOUR_CLIENT_SECRET"
        });

        if (softphoneInstance) {
            setSoftphone(softphoneInstance);
            console.log("Logged in successfully!");
        }
    } catch (e) {
        console.error("Direct login failed", e);
    }
};

3. Starting the Engine & Event Listeners

You must call start() to connect the WebSocket and register for events.

useEffect(() => {
    if (!softphone) return;

    const listeners = {
        onConnectionStateChange: (type, state, isError) => {
            console.log(`Status: ${state}`); // e.g., Registered, Connected, Disconnected
        },

        // ARGS: Type ('Incoming'/'Outgoing'), Session Object, Details
        onCallCreated: (type, session, details) => {
            console.log(`Call: ${type}, Candidate: ${details.candidate}`);
            activeSession.current = session; // IMPORTANT: Store session ref
            
            if (type === 'Incoming') {
                // Show incoming call UI
            }
        },

        onCallAnswered: (session) => { /* Call is live */ },

        onCallHangup: (session) => {
            // IGNORE "Ghost Hangups" from call forking
            if (activeSession.current && activeSession.current !== session) return;
            activeSession.current = null;
        },
        
        onSessionRefresh: (payload) => {
            console.log("Session was refreshed automatically. New tokens:", payload);
            // Optionally, save these new tokens to your app's state management or storage
        }
    };

    softphone.start(listeners).then(() => {
        console.log("SDK started and ready to make calls!");
    });
}, [softphone]);

4. Managing Calls

// --- OUTGOING ---
// Option 1: Use default caller ID from user profile
await softphone.makeCall('+919876543210');

// Option 2: Use a specific Virtual Number (Caller ID)
await softphone.makeCall('+919876543210', '+918012345678');

// --- INCOMING ---
// Answer an incoming call
await activeSession.current.answer();

// Hangup or Reject a call
await activeSession.current.hangup();

5. Using Virtual Numbers

Fetch the list of numbers assigned to the user to build a "Select Caller ID" UI.

const numbers = softphone.getVirtualNumbers();
// Returns: [{ name: "Office", country_code: "+91", number: "...", default_calling_number: true }, ...]

6. Manual Reconnect

If the connection drops, you can provide a manual reconnection trigger.

try {
    await softphone.connect();
} catch (e) {
    Alert.alert("Reconnection failed", "Please check your network connection.");
}

📡 Handling Background/Killed State

Standard WebSockets are terminated when an app is killed. To receive calls in this state, you must implement a native VoIP push notification solution.

1. Background (App Minimized): The SDK listens to AppState changes and automatically attempts to reconnect the socket when the app is brought to the foreground.
2. Killed (App Closed):
   • Android: Requires a solution using FCM Data Messages, react-native-callkeep, and a Foreground Service.
   • iOS: Requires APNs PushKit (VoIP Push) integrated with react-native-callkeep and Apple's CallKit framework.

📚 API Reference

Softphone Class

| Method | Returns | Description | | :--- | :--- | :--- | | static initialize(creds) | Promise<Softphone \| null> | Configures SDK with credentials, restores a previous session from storage, and checks permissions. | | static login(params?) | Promise<Softphone \| void> | If params {accessToken, email, refreshToken, clientId?, clientSecret?} are provided, logs in directly. refreshToken is required. Note: clientId and clientSecret are only used to refresh the token if the provided accessToken is already expired. If no params are given, it initiates the standard browser OAuth flow. | | static handleRedirect(url) | Promise<Softphone> | Exchanges the authorization code from a deep link URL for session tokens and completes the browser login flow. | | start(listeners) | Promise<void> | Connects the WebSocket, registers the SIP user agent, fetches the user profile, and attaches event listeners. Includes onSessionRefresh listener. | | connect() | Promise<void> | Manually attempts to reconnect the transport and re-register the SIP user agent. | | makeCall(to, [from]) | Promise<boolean> | Initiates an outbound call. Updates the user's primary virtual number if from differs from the current default. | | getVirtualNumbers() | VirtualNumber[] | Returns an array of available caller IDs (virtual numbers) for the authenticated user. | | getTokens() | TokenPayload \| null | Returns the current session tokens (accessToken, refreshToken, email). | | logout() | Promise<void> | Destroys the current session, unregisters the SIP user agent, and clears all credentials from secure storage. |

Session Class

| Method | Description | | :--- | :--- | | answer() | Accepts an incoming call. | | hangup() | Ends the current call (can be used to cancel, reject, or terminate). |

⚠️ Troubleshooting

Q: TypeError: answer is not a function

• Fix: Ensure your onCallCreated listener receives 3 arguments: (type, session, details). You are likely trying to call .answer() on the details object instead of the session object.

Q: Calls drop immediately with "Ghost Hangup"

• Fix: This is caused by SIP Call Forking. To prevent this, your onCallHangup listener must check if the session being hung up is the currently active one: if (activeSession.current !== session) return;.

Q: 401 Unauthorized Errors

• Fix: The SDK handles this automatically with its Auto-Refresh mechanism. It will detect the error, refresh the session tokens using the stored refresh token, and retry the failed request. No action is required from you.
• Note: If you need to be notified when tokens are refreshed (e.g., to update your own app's state or storage), use the onSessionRefresh event listener passed to the start() method.

License: MIT