Sinch Node.js SDK for Voice API

The Sinch Voice API Node.js SDK allows you to quickly interact with the Voice API from inside your Node.js applications. The fastest way to get started with the SDK is to check out our getting started guides. There you'll find all the instructions necessary to download, install, set up, and start using the SDK.

Syntax

When using the Node.js SDK, the code representing requests and queries sent to and responses received from the Voice API are structured similarly to those that are sent and received using the Verification API itself.

The code sample on the side of this page is an example of how to use the Node.js SDK to make a Text to speech phone call. The code is also displayed below, along with a Voice REST API call that accomplishes the same task, for reference:

const APPLICATION_KEY = "";
const APPLICATION_SECRET = "";
const SINCH_NUMBER = "";
const LOCALE = "";
const TO_NUMBER = "";

const basicAuthentication = APPLICATION_KEY + ":" + APPLICATION_SECRET;

const fetch = require('cross-fetch');
const ttsBody = {
  method: 'ttsCallout',
  ttsCallout: {
    cli: SINCH_NUMBER,
    destination: {
      type: 'number',
      endpoint: TO_NUMBER
    },
    locale: LOCALE,
    text: 'This is a call from sinch',
  }
};

fetch("https://calling.api.sinch.com/calling/v1/callouts", {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      Authorization: 'Basic ' + Buffer.from(basicAuthentication).toString('base64')
    },
    body: JSON.stringify(ttsBody)
  }).then(res => res.json()).then(json => console.log(json));

const {SinchClient} = require('@sinch/sdk-core');

const sinchClient = new SinchClient({
    applicationKey: 'YOUR_application_key',
    applicationSecret: 'YOUR_application_secret'
});

async function makeCall(){
    const response = await sinchClient.voice.callouts.tts({
        ttsCalloutRequestBody: {
           method: 'ttsCallout',
           ttsCallout: {
               cli: 'YOUR_Sinch_number',
               destination: {
                   type: 'number',
                   endpoint: 'YOUR_phone_number'
               },
               text: 'This is a test call from Sinch using the Node.js SDK.'
           }
        }
    });
       
    console.log(JSON.stringify(response));    
}

makeCall();

This example highlights the following required to successfully make a Voice API call using the Sinch Node.js SDK:

• Client initialization
• Voice domain access
• Endpoint usage
• Field population

Client

When using the Sinch Node.js SDK, you initialize communication with the Sinch backend by initializing the Node.js SDK's main client class. This client allows you to access the functionality of the Sinch Node.js SDK.

Initialization

To start using the SDK, you need to initialize the main client class with your credentials from your Sinch dashboard.

const {SinchClient} = require('@sinch/sdk-core');

const sinchClient = new SinchClient({
    applicationKey: "YOUR_application_key",
    applicationSecret: "YOUR_application_secret"
});

APPKEY="YOUR_application_key"
APPSECRET="YOUR_application_secret" 

const {SinchClient} = require('@sinch/sdk-core');

const sinchClient = new SinchClient({
    applicationKey: process.env.APPKEY,
    applicationSecret: process.env.APPSECRET
});

const {SinchClient} = require('@sinch/sdk-core');

const sinchClient = new SinchClient({
    projectId: "YOUR_project_id",
    keyId: "YOUR_access_key",
    keySecret: "YOUR_access_secret",
    applicationKey: "YOUR_application_key",
    applicationSecret: "YOUR_application_secret"
});

Voice domain

Endpoint categories

In the Sinch Node.js SDK, Voice API endpoints are accessible through the client. The naming convention of the endpoint's representation in the SDK matches the API:

• voice.callouts
• voice.calls
• voice.conferences
• voice.applications

For example:

const response = await sinchClient.voice.callouts.tts({
        ttsCalloutRequestBody: {
           method: 'ttsCallout',
           ttsCallout: {
               cli: 'YOUR_Sinch_number',
               destination: {
                   type: 'number',
                   endpoint: 'YOUR_phone_number'
               },
               text: 'This is a test call from Sinch using the Node.js SDK.'
           }
        }
       });

voice.callouts endpoint category

voice.calls endpoint category

voice.conferences endpoint category

voice.applications endpoint category

Call events and SVAML

The Voice API uses call events and SVAML responses to dynamically control calls throughout their life cycle. The Node.js SDK has a number of builder and helper methods designed to aid in quickly constructing the correct SVAML responses for the various call events. The builder and helper methods available and their parameters are described in the example and tables below.

const iceResponse = new Voice.IceSvamletBuilder()
        .setAction(Voice.iceActionHelper.hangup())
        .addInstruction(Voice.iceInstructionHelper.say('Thank you for calling Sinch! This call will now end.', 'en-US'))
        .build();

Using these builder methods you can then build your SVAML responses using the following methods:

Actions:

Instructions:

Request and query parameters

Requests and queries made using the Node.js SDK are similar to those made using the Voice API. Path parameters, request body parameters, and query parameters that are used in the API are all passed as arguments to the corresponding Node.js method.

const response = await sinchClient.voice.calls.get({
        callId: 'YOUR_call_id'
    });

url = "https://calling.api.sinch.com/calling/v1/calls/id/" + callId

Responses

Response fields match the API responses. They are delivered as Javascript objects.