Telnyx Voice Javascript

---
name: telnyx-voice-javascript
description: >-
  Make and receive calls, transfer, bridge, and manage call lifecycle with Call
  Control. Includes application management and call events. This skill provides
  JavaScript SDK examples.
metadata:
  author: telnyx
  product: voice
  language: javascript
---

# Telnyx Voice - JavaScript

## Installation

```bash
npm install telnyx
```

## Setup

```javascript
import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});
```

All examples below assume `client` is already initialized as shown above.

## Answer call

Answer an incoming call.

`POST /calls/{call_control_id}/actions/answer`

```javascript
const response = await client.calls.actions.answer('call_control_id');

console.log(response.data);
```

## Bridge calls

Bridge two call control calls.

`POST /calls/{call_control_id}/actions/bridge` — Required: `call_control_id`

```javascript
const response = await client.calls.actions.bridge('call_control_id', {
  call_control_id_to_bridge_with: 'v3:MdI91X4lWFEs7IgbBEOT9M4AigoY08M0WWZFISt1Yw2axZ_IiE4pqg',
});

console.log(response.data);
```

## Dial

Dial a number or SIP URI from a given connection.

`POST /calls` — Required: `connection_id`, `to`, `from`

```javascript
const response = await client.calls.dial({
  connection_id: '7267xxxxxxxxxxxxxx',
  from: '+18005550101',
  to: '+18005550100 or sip:username@sip.telnyx.com',
});

console.log(response.data);
```

## Hangup call

Hang up the call.

`POST /calls/{call_control_id}/actions/hangup`

```javascript
const response = await client.calls.actions.hangup('call_control_id');

console.log(response.data);
```

## Transfer call

Transfer a call to a new destination.

`POST /calls/{call_control_id}/actions/transfer` — Required: `to`

```javascript
const response = await client.calls.actions.transfer('call_control_id', {
  to: '+18005550100 or sip:username@sip.telnyx.com',
});

console.log(response.data);
```

## List all active calls for given connection

Lists all active calls for given connection.

`GET /connections/{connection_id}/active_calls`

```javascript
// Automatically fetches more pages as needed.
for await (const connectionListActiveCallsResponse of client.connections.listActiveCalls(
  '1293384261075731461',
)) {
  console.log(connectionListActiveCallsResponse.call_control_id);
}
```

## List call control applications

Return a list of call control applications.

`GET /call_control_applications`

```javascript
// Automatically fetches more pages as needed.
for await (const callControlApplication of client.callControlApplications.list()) {
  console.log(callControlApplication.id);
}
```

## Create a call control application

Create a call control application.

`POST /call_control_applications` — Required: `application_name`, `webhook_event_url`

```javascript
const callControlApplication = await client.callControlApplications.create({
  application_name: 'call-router',
  webhook_event_url: 'https://example.com',
});

console.log(callControlApplication.data);
```

## Retrieve a call control application

Retrieves the details of an existing call control application.

`GET /call_control_applications/{id}`

```javascript
const callControlApplication = await client.callControlApplications.retrieve('id');

console.log(callControlApplication.data);
```

## Update a call control application

Updates settings of an existing call control application.

`PATCH /call_control_applications/{id}` — Required: `application_name`, `webhook_event_url`

```javascript
const callControlApplication = await client.callControlApplications.update('id', {
  application_name: 'call-router',
  webhook_event_url: 'https://example.com',
});

console.log(callControlApplication.data);
```

## Delete a call control application

Deletes a call control application.

`DELETE /call_control_applications/{id}`

```javascript
const callControlApplication = await client.callControlApplications.delete('id');

console.log(callControlApplication.data);
```

## List call events

Filters call events by given filter parameters.

`GET /call_events`

```javascript
// Automatically fetches more pages as needed.
for await (const callEventListResponse of client.callEvents.list()) {
  console.log(callEventListResponse.call_leg_id);
}
```

---

## Webhooks

The following webhook events are sent to your configured webhook URL.
All webhooks include `telnyx-timestamp` and `telnyx-signature-ed25519` headers for verification (Standard Webhooks compatible).

| Event | Description |
|-------|-------------|
| `callAnswered` | Call Answered |
| `callStreamingStarted` | Call Streaming Started |
| `callStreamingStopped` | Call Streaming Stopped |
| `callStreamingFailed` | Call Streaming Failed |
| `callBridged` | Call Bridged |
| `callInitiated` | Call Initiated |
| `callHangup` | Call Hangup |
| `callRecordingSaved` | Call Recording Saved |
| `callMachineDetectionEnded` | Call Machine Detection Ended |
| `callMachineGreetingEnded` | Call Machine Greeting Ended |
| `callMachinePremiumDetectionEnded` | Call Machine Premium Detection Ended |
| `callMachinePremiumGreetingEnded` | Call Machine Premium Greeting Ended |