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WebRTC SDKs

Telnyx WebRTC SDKs enable you to build real-time voice and video communication applications directly in web browsers and mobile apps. Our SDKs provide a complete solution for WebRTC-based calling with features like call control, media management, and seamless integration with Telnyx's global network.

Core Concepts ​

Before diving into the SDKs, familiarize yourself with these key concepts:

Client SDKs ​

JavaScript SDK ​

The official Telnyx JavaScript SDK for web browsers and Node.js applications.

npm install @telnyx/webrtc

Features:

  • Browser-based calling and receiving
  • Call control (hold, mute, transfer)
  • Dual-tone multi-frequency (DTMF) support
  • Audio device management
  • Call recording capabilities

iOS SDK ​

The official Telnyx iOS SDK for iPhone and iPad applications.

pod 'TelnyxRTC'

Features:

  • Native iOS calling experience
  • Background app support
  • Push notifications for incoming calls
  • CallKit integration
  • Bluetooth headset support

Android SDK ​

The official Telnyx Android SDK for Android applications.

implementation 'com.telnyx:webrtc-android:LATEST'

Features:

  • Native Android calling experience
  • Background service support
  • Push notifications for incoming calls
  • Audio focus management
  • Bluetooth headset support

Flutter SDK ​

The official Telnyx Flutter SDK for cross-platform mobile applications.

dependencies:
  telnyx_webrtc: ^LATEST

Features:

  • Cross-platform iOS and Android support
  • Single codebase for multiple platforms
  • Native performance and UI
  • Push notifications support
  • Platform-specific integrations

Getting Started ​

1. Choose Your Platform ​

Select the SDK that matches your target platform:

  • Web applications: JavaScript SDK
  • iOS native apps: iOS SDK
  • Android native apps: Android SDK
  • Cross-platform mobile: Flutter SDK

2. Set Up Authentication ​

Configure your WebRTC credentials:

3. Install and Initialize ​

Follow the installation guide for your chosen platform and initialize the SDK with your credentials.

4. Make Your First Call ​

Use the SDK's calling methods to place and receive calls through Telnyx's network.

Key Features ​

All Telnyx WebRTC SDKs provide:

Core Calling Features ​

  • Outbound calling: Place calls to phone numbers and SIP addresses
  • Inbound calling: Receive calls with webhook notifications
  • Call control: Hold, mute, transfer, and end calls
  • DTMF support: Send touch-tone signals during calls

Media Management ​

  • Audio codecs: Support for multiple audio codecs (Opus, G.711, G.722)
  • Device management: Select microphones, speakers, and cameras
  • Audio processing: Echo cancellation and noise suppression
  • Recording: Server-side call recording capabilities

Mobile-Specific Features ​

  • Push notifications: Receive incoming call notifications when app is closed
  • Background operation: Continue calls when app is backgrounded
  • Platform integration: CallKit (iOS) and ConnectionService (Android)
  • Battery optimization: Efficient power usage during calls

Advanced Topics ​

Push Notifications ​

Learn how to implement push notifications for incoming calls:

Troubleshooting ​

Debug and resolve common issues:

Support and Resources ​

  • Sample Applications: Each SDK repository includes complete example applications
  • API Reference: Detailed API documentation for each SDK
  • GitHub Issues: Report bugs or request features on the respective repositories
  • Developer Community: Join our Developer Community
  • Support: Contact Telnyx Support for technical assistance

Network Requirements ​

For optimal WebRTC performance, ensure your network supports:

  • UDP traffic: WebRTC uses UDP for media streams
  • STUN/TURN: For NAT traversal and firewall traversal
  • Signaling: WebSocket connections for call signaling
  • Media ports: Configurable RTP port ranges

Learn more about network requirements in our WebRTC Fundamentals guide.