npm install @telnyx/webrtc --save

import { TelnyxRTC } from '@telnyx/webrtc';

const client = new TelnyxRTC({
  login_token: 'your_jwt_token',
});

client.connect();

const client = new TelnyxRTC({
  login: 'sip_username',
  password: 'sip_password',
});

client.connect();

// When done, disconnect and remove listeners
client.disconnect();
client.off('telnyx.ready');
client.off('telnyx.notification');

client.remoteElement = 'remoteMedia';

<audio id="remoteMedia" autoplay="true" />

let activeCall;

client
  .on('telnyx.ready', () => {
    console.log('Ready to make calls');
  })
  .on('telnyx.error', (error) => {
    console.error('Error:', error);
  })
  .on('telnyx.notification', (notification) => {
    if (notification.type === 'callUpdate') {
      activeCall = notification.call;
      
      // Handle incoming call
      if (activeCall.state === 'ringing') {
        // Show incoming call UI
        // Call activeCall.answer() to accept
      }
    }
  });

const call = client.newCall({
  destinationNumber: '+18004377950',
  callerNumber: '+15551234567',
});

client.on('telnyx.notification', (notification) => {
  const call = notification.call;
  
  if (notification.type === 'callUpdate' && call.state === 'ringing') {
    // Incoming call - show UI and answer
    call.answer();
  }
});

// End call
call.hangup();

// Send DTMF tones
call.dtmf('1234');

// Mute audio
call.muteAudio();
call.unmuteAudio();

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

const call = client.newCall({
  destinationNumber: '+18004377950',
  debug: true,
  debugOutput: 'socket',  // 'socket' (send to Telnyx) or 'file' (save locally)
});

const call = client.newCall({
  destinationNumber: '+18004377950',
  debug: true,  // Required for metrics
});

client.on('telnyx.stats.frame', (stats) => {
  console.log('Quality stats:', stats);
  // Contains jitter, RTT, packet loss, etc.
});

import { PreCallDiagnosis } from '@telnyx/webrtc';

PreCallDiagnosis.run({
  credentials: {
    login: 'sip_username',
    password: 'sip_password',
    // or: loginToken: 'jwt_token'
  },
  texMLApplicationNumber: '+12407758982',
})
  .then((report) => {
    console.log('Diagnosis report:', report);
  })
  .catch((error) => {
    console.error('Diagnosis failed:', error);
  });

const allCodecs = RTCRtpReceiver.getCapabilities('audio').codecs;

// Prefer Opus for AI/high quality
const opusCodec = allCodecs.find(c => 
  c.mimeType.toLowerCase().includes('opus')
);

// Or PCMA for telephony compatibility
const pcmaCodec = allCodecs.find(c => 
  c.mimeType.toLowerCase().includes('pcma')
);

client.newCall({
  destinationNumber: '+18004377950',
  preferred_codecs: [opusCodec],
});

const isRegistered = await client.getIsRegistered();
console.log('Registered:', isRegistered);

const client = new TelnyxRTC({
  anonymous_login: {
    target_id: 'your-ai-assistant-id',
    target_type: 'ai_assistant',
  },
});

client.connect();

// After anonymous login, destinationNumber is ignored
const call = client.newCall({
  destinationNumber: '',  // Can be empty
  remoteElement: 'remoteMedia',
});

const allCodecs = RTCRtpReceiver.getCapabilities('audio').codecs;
const opusCodec = allCodecs.find(c => 
  c.mimeType.toLowerCase().includes('opus')
);

client.newCall({
  destinationNumber: '',
  preferred_codecs: [opusCodec],  // Opus recommended for AI
});

const webRTCInfo = TelnyxRTC.webRTCInfo;
console.log('WebRTC supported:', webRTCInfo.supportWebRTC);

// Initialize the client
const client = new TelnyxRTC({
  // Use a JWT to authenticate (recommended)
  login_token: login_token,
  // or use your Connection credentials
  //  login: username,
  //  password: password,
});

// Attach event listeners
client
  .on('telnyx.ready', () => console.log('ready to call'))
  .on('telnyx.notification', (notification) => {
    console.log('notification:', notification);
  });

// Connect and login
client.connect();

// You can call client.disconnect() when you're done.
// Note: When you call `client.disconnect()` you need to remove all ON event methods you've had attached before.

// Disconnecting and Removing listeners.
client.disconnect();
client.off('telnyx.ready');
client.off('telnyx.notification');

const client = new TelnyxRTC(options);

client.checkPermissions();

const client = new TelnyxRTC(options);

client.disableMicrophone();

const client = new TelnyxRTC(options);

client.enableMicrophone();

async function() {
  const client = new TelnyxRTC(options);
  let result = await client.getDeviceResolutions();
  console.log(result);
}

async function() {
  const client = new TelnyxRTC(options);
  let result = await client.getDevices();
  console.log(result);
}

async function() {
  const client = new TelnyxRTC(options);
  let result = await client.getVideoDevices();
  console.log(result);
}

const call = client.newCall().catch(console.error);
// => `destinationNumber is required`

client.newCall({
  destinationNumber: 'xxx',
  prefetchIceCandidates: false,
});

client.newCall({
  destinationNumber: 'xxx',
  trickleIce: true,
});

// within an async function
const constraints = await client.setAudioSettings({
  micId: '772e94959e12e589b1cc71133d32edf543d3315cfd1d0a4076a60601d4ff4df8',
  micLabel: 'Internal Microphone (Built-in)',
  echoCancellation: false,
});

const info = TelnyxRTC.webRTCInfo();
const isWebRTCSupported = info.supportWebRTC;
console.log(isWebRTCSupported); // => true

const browserList = TelnyxRTC.webRTCSupportedBrowserList();
console.log(browserList); // => [{"operationSystem": "Android", "supported": [{"browserName": "Chrome", "features": ["video", "audio"], "supported": "full"},{...}]

const call = client.newCall({
  // Destination is required and can be a phone number or SIP URI
  destinationNumber: '18004377950',
  callerNumber: '‬155531234567',
});

client.on('telnyx.notification', (notification) => {
  const call = notification.call;

  if (notification.type === 'callUpdate' && call.state === 'ringing') {
    call.answer();
  }
});

// Hangup or reject an incoming call
call.hangup();

// Send digits and keypresses
call.dtmf('1234');

// Call states that can be toggled
call.hold();
call.muteAudio();

await call.setAudioInDevice('abc123');

await call.setAudioOutDevice('abc123');

await call.setVideoDevice('abc123');