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Route to a VBC Extension

This code snippet shows you how to connect an inbound call on a Smart Number to an extension.

Example

The following example shows how to receive the inbound call and immediately forward it to your chosen VBC extension.

You achieve this with a connect action in the Nexmo Call Control Object (NCCO). Create an endpoint with a type of vbc and the extension you want to forward the call to.

Prerequisites

Create an application

A Nexmo application contains the required configuration for your project. You can create an application using the Nexmo CLI (see below) or via the dashboard. To learn more about applications see our Nexmo concepts guide.

Install the CLI

npm install -g nexmo-cli

Create an application

Once you have the CLI installed you can use it to create a Nexmo application. Run the following command and make a note of the application ID that it returns. This is the value to use in NEXMO_APPLICATION_ID in the example below. It will also create private.key in the current directory which you will need in the Initialize your dependencies step

Nexmo needs to connect to your local machine to access your answer_url. We recommend using ngrok to do this. Make sure to change demo.ngrok.io in the examples below to your own ngrok URL.

nexmo app:create "Connect to VBC Extension Example" http://demo.ngrok.io/webhooks/answer http://demo.ngrok.io/webhooks/events --keyfile private.key
Install dependencies

npm install express
Initialize your dependencies

Create a file named connect-to-extension.js and add the following code:

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const app = require('express')()

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Write the code

Add the following to connect-to-extension.js:

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const onInboundCall = (request, response) => {
  const ncco = [{
    action: 'connect',
    endpoint: [{
      type: 'vbc',
      extension: VBC_EXTENSION
    }]
  }]

  response.json(ncco)
}

app.get('/webhooks/answer', onInboundCall)

app.listen(3000)

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Run your code

Save this file to your machine and run it:

node connect-to-extension.js

Try it out

When you call your Smart Number it should immediately forward the call to the extension number you specified.