Telnyx WebRTC - React Native SDK

Build real-time voice communication into React Native apps (Android & iOS) using the @telnyx/react-voice-commons-sdk library.

Prerequisites: Create WebRTC credentials and generate a login token using the Telnyx server-side SDK. See the telnyx-webrtc-* skill in your server language plugin (e.g., telnyx-python, telnyx-javascript).

Features

• Reactive Streams: RxJS-based state management
• Automatic Lifecycle: Background/foreground handling
• Native Call UI: CallKit (iOS) and ConnectionService (Android)
• Push Notifications: FCM (Android) and APNs/PushKit (iOS)
• TypeScript Support: Full type definitions

Installation

npm install @telnyx/react-voice-commons-sdk

---

Basic Setup

import { TelnyxVoiceApp, createTelnyxVoipClient } from '@telnyx/react-voice-commons-sdk';

// Create VoIP client instance
const voipClient = createTelnyxVoipClient({
  enableAppStateManagement: true,  // Auto background/foreground handling
  debug: true,                     // Enable logging
});

export default function App() {
  return (
    <TelnyxVoiceApp 
      voipClient={voipClient} 
      enableAutoReconnect={false} 
      debug={true}
    >
      <YourAppContent />
    </TelnyxVoiceApp>
  );
}

---

Authentication

Credential-Based Login

import { createCredentialConfig } from '@telnyx/react-voice-commons-sdk';

const config = createCredentialConfig('sip_username', 'sip_password', {
  debug: true,
  pushNotificationDeviceToken: 'your_device_token',
});

await voipClient.login(config);

Token-Based Login (JWT)

import { createTokenConfig } from '@telnyx/react-voice-commons-sdk';

const config = createTokenConfig('your_jwt_token', {
  debug: true,
  pushNotificationDeviceToken: 'your_device_token',
});

await voipClient.loginWithToken(config);

Auto-Reconnection

The library automatically stores credentials for seamless reconnection:

// Automatically reconnects using stored credentials
const success = await voipClient.loginFromStoredConfig();

if (!success) {
  // No stored auth, show login UI
}

---

Reactive State Management

import { useEffect, useState } from 'react';

function CallScreen() {
  const [connectionState, setConnectionState] = useState(null);
  const [calls, setCalls] = useState([]);
  
  useEffect(() => {
    // Subscribe to connection state
    const connSub = voipClient.connectionState$.subscribe((state) => {
      setConnectionState(state);
    });
    
    // Subscribe to active calls
    const callsSub = voipClient.calls$.subscribe((activeCalls) => {
      setCalls(activeCalls);
    });
    
    return () => {
      connSub.unsubscribe();
      callsSub.unsubscribe();
    };
  }, []);
  
  return (/* UI */);
}

Individual Call State

useEffect(() => {
  if (call) {
    const sub = call.callState$.subscribe((state) => {
      console.log('Call state:', state);
    });
    return () => sub.unsubscribe();
  }
}, [call]);

---

Making Calls

const call = await voipClient.newCall('+18004377950');

---

Receiving Calls

Incoming calls are handled automatically via push notifications and the TelnyxVoiceApp wrapper. The native call UI (CallKit/ConnectionService) is displayed automatically.

---

Call Controls

// Answer incoming call
await call.answer();

// Mute/Unmute
await call.mute();
await call.unmute();

// Hold/Unhold
await call.hold();
await call.unhold();

// End call
await call.hangup();

// Send DTMF
await call.dtmf('1');

---

Push Notifications - Android (FCM)

1. Place google-services.json in project root

2. MainActivity Setup

// MainActivity.kt
import com.telnyx.react_voice_commons.TelnyxMainActivity

class MainActivity : TelnyxMainActivity() {
    override fun onHandleIntent(intent: Intent) {
        super.onHandleIntent(intent)
        // Additional intent processing
    }
}

3. Background Message Handler

// index.js or App.tsx
import messaging from '@react-native-firebase/messaging';
import { TelnyxVoiceApp } from '@telnyx/react-voice-commons-sdk';

messaging().setBackgroundMessageHandler(async (remoteMessage) => {
  await TelnyxVoiceApp.handleBackgroundPush(remoteMessage.data);
});

---

Push Notifications - iOS (PushKit)

AppDelegate Setup

// AppDelegate.swift
import PushKit
import TelnyxVoiceCommons

@UIApplicationMain
public class AppDelegate: ExpoAppDelegate, PKPushRegistryDelegate {
  
  public override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil
  ) -> Bool {
    // Initialize VoIP push registration
    TelnyxVoipPushHandler.initializeVoipRegistration()
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
  
  // VoIP Push Token Update
  public func pushRegistry(_ registry: PKPushRegistry, 
                           didUpdate pushCredentials: PKPushCredentials, 
                           for type: PKPushType) {
    TelnyxVoipPushHandler.shared.handleVoipTokenUpdate(pushCredentials, type: type)
  }
  
  // VoIP Push Received
  public func pushRegistry(_ registry: PKPushRegistry, 
                           didReceiveIncomingPushWith payload: PKPushPayload, 
                           for type: PKPushType, 
                           completion: @escaping () -> Void) {
    TelnyxVoipPushHandler.shared.handleVoipPush(payload, type: type, completion: completion)
  }
}

Note: CallKit integration is automatically handled by the internal CallBridge component.

---

Configuration Options

createTelnyxVoipClient Options

Option	Type	Default	Description
enableAppStateManagement	boolean	true	Auto background/foreground handling
debug	boolean	false	Enable debug logging

TelnyxVoiceApp Props

Prop	Type	Description
voipClient	TelnyxVoipClient	The VoIP client instance
enableAutoReconnect	boolean	Auto-reconnect on disconnect
debug	boolean	Enable debug logging

---

Storage Keys (Managed Automatically)

The library manages these AsyncStorage keys internally:

• @telnyx_username - SIP username
• @telnyx_password - SIP password
• @credential_token - JWT token
• @push_token - Push notification token

You don't need to manage these manually.

---

Troubleshooting

Issue	Solution
Double login	Don't call login() manually when using TelnyxVoiceApp with auto-reconnect
Background disconnect	Check enableAutoReconnect setting
Android push not working	Verify google-services.json and MainActivity extends TelnyxMainActivity
iOS push not working	Ensure AppDelegate implements PKPushRegistryDelegate and calls TelnyxVoipPushHandler
Memory leaks	Unsubscribe from RxJS observables in useEffect cleanup
Audio issues	iOS audio handled by CallBridge; Android check ConnectionService

Clear Stored Auth (Advanced)

import AsyncStorage from '@react-native-async-storage/async-storage';

await AsyncStorage.multiRemove([
  '@telnyx_username',
  '@telnyx_password', 
  '@credential_token',
  '@push_token',
]);

---

API Reference

TelnyxVoipClient

Class: TelnyxVoipClient

The main public interface for the react-voice-commons module.

This class serves as the Façade for the entire module, providing a simplified API that completely hides the underlying complexity. It is the sole entry point for developers using the react-voice-commons package.

The TelnyxVoipClient is designed to be state-management agnostic, exposing all observable state via RxJS streams. This allows developers to integrate it into their chosen state management solution naturally.

Methods

login()

login(config): Promise<void>

Parameters

config

CredentialConfig

Returns

A Promise that completes when the connection attempt is initiated

loginWithToken()

loginWithToken(config): Promise<void>

Parameters

config

TokenConfig

Returns

A Promise that completes when the connection attempt is initiated

logout()

logout(): Promise<void>

Returns

loginFromStoredConfig()

loginFromStoredConfig(): Promise<boolean>

Returns

newCall()

newCall(destination, callerName?, callerNumber?, customHeaders?): Promise<Call>

Parameters

destination

The destination number or SIP URI to call

callerName?

Optional caller name to display

callerNumber?

Optional caller ID number

customHeaders?

Optional custom headers to include with the call

Returns

A Promise that completes with the Call object once the invitation has been sent

handlePushNotification()

handlePushNotification(payload): Promise<void>

Parameters

payload

The push notification payload

Returns

disablePushNotifications()

disablePushNotifications(): void

Returns

setCallConnecting()

setCallConnecting(callId): void

Parameters

callId

The ID of the call to set to connecting state

Returns

findCallByTelnyxCall()

findCallByTelnyxCall(telnyxCall): Call

Parameters

telnyxCall

The Telnyx call object to find

Returns

Call

queueAnswerFromCallKit()

queueAnswerFromCallKit(customHeaders): void

Parameters

customHeaders

Optional custom headers to include with the answer

Returns

queueEndFromCallKit()

queueEndFromCallKit(): void

Returns

dispose()

dispose(): void

Returns

Call

Class: Call

Represents a call with reactive state streams.

This class wraps the underlying Telnyx Call object and provides reactive streams for all call state changes, making it easy to integrate with any state management solution.

Methods

answer()

answer(customHeaders?): Promise<void>

Parameters

customHeaders?

Optional custom headers to include with the answer

Returns

hangup()

hangup(customHeaders?): Promise<void>

Parameters

customHeaders?

Optional custom headers to include with the hangup request

Returns

hold()

hold(): Promise<void>

Returns

resume()

resume(): Promise<void>

Returns

mute()

mute(): Promise<void>

Returns

unmute()

unmute(): Promise<void>

Returns

toggleMute()

toggleMute(): Promise<void>

Returns

setConnecting()

setConnecting(): void

Returns

dispose()

dispose(): void

Returns

TelnyxCallState

Enumeration: TelnyxCallState

Represents the state of a call in the Telnyx system.

This enum provides a simplified view of call states, abstracting away the complexity of the underlying SIP call states.

Enumeration Members

RINGING

RINGING: "RINGING"

CONNECTING

CONNECTING: "CONNECTING"

ACTIVE

ACTIVE: "ACTIVE"

HELD

HELD: "HELD"

ENDED

ENDED: "ENDED"

FAILED

FAILED: "FAILED"

DROPPED

DROPPED: "DROPPED"

TelnyxConnectionState

Enumeration: TelnyxConnectionState

Represents the connection state to the Telnyx platform.

This enum provides a simplified view of the connection status, abstracting away the complexity of the underlying WebSocket states.

Enumeration Members

DISCONNECTED

DISCONNECTED: "DISCONNECTED"

CONNECTING

CONNECTING: "CONNECTING"

CONNECTED

CONNECTED: "CONNECTED"

RECONNECTING

RECONNECTING: "RECONNECTING"

ERROR

ERROR: "ERROR"