text: module.exports = function(callback, config) {
  
    var Nexmo = require('../lib/Nexmo');
  
    var nexmo = new Nexmo({
        apiKey: config.API_KEY, 
        apiSecret: config.API_SECRET,
        applicationId: config.APP_ID,
        privateKey: config.PRIVATE_KEY
      },
      {debug: config.DEBUG}
    );
    
    nexmo.calls.create({
      to: [{
        type: 'phone',
        number: config.TO_NUMBER
      }],
      from: {
        type: 'phone',
        number: config.FROM_NUMBER
      },
      answer_url: ['https://nexmo-community.github.io/ncco-examples/first_call_talk.json']
    }, callback);
  };
  