Twilio Cookbook

By Roger Stringer

This book is a practical, hands-on guide that provides the reader with a number of clear, step-by-step exercises. This book is great for developers who already have knowledge of PHP and MySQL and who want to learn about integrating Twilio’s API into their websites for telephone solutions.

• Language: English
• Publisher: Packt Publishing
• Release date: Sep 18, 2013
• ISBN: 9781782166078

Book preview

Table of Contents

Twilio Cookbook

Credits

About the Author

About the Reviewer

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Free Access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Into the Frying Pan

Introduction

Adding two-factor voice authentication to verify users

Getting ready

How to do it...

How it works...

Using Twilio SMS to set up two-factor authentication for secure websites

Getting ready

How to do it...

How it works...

Adding order verification

Getting ready

How to do it...

How it works...

Adding the Click-to-Call functionality to your website

Getting ready

How to do it...

How it works...

Recording a phone call

Getting ready

How to do it...

How it works...

Setting up a company directory

Getting ready

How to do it...

How it works...

Setting up Text-to-Speech

Getting ready

How to do it...

How it works...

2. Now We're Cooking

Introduction

Tracking account usage

Getting ready

How to do it...

How it works...

Screening calls

Getting ready

How to do it...

How it works...

Buying a phone number

Getting ready

How to do it...

How it works…

Setting up a voicemail system

Getting ready

How to do it...

How it works...

Building an emergency calling system

Getting ready

How to do it...

How it works...

3. Conducting Surveys via SMS

Introduction

Why use PDO instead of the standard MySQL functions?

Letting users subscribe to receive surveys

Getting ready

How to do it...

How it works...

Building a survey tree

Getting ready

How to do it...

How it works...

Sending a survey to your users

Getting ready

How to do it...

How it works...

Adding tracking for each user

Getting ready

How to do it...

How it works...

Listening to user responses and commands

Getting ready

How to do it...

How it works...

Building a chart of responses

Getting ready

How to do it...

How it works...

4. Building a Conference Calling System

Introduction

Scheduling a conference call

Getting ready

How to do it...

How it works...

Sending an SMS to all participants at the time of the call

Getting ready

How to do it...

How it works...

Starting and recording a conference

Getting ready

How to do it...

How it works...

Joining a conference call from the web browser

Getting ready

How to do it...

How it works...

Monitoring the conference call

Getting ready

How to do it...

How it works...

Muting a participant

Getting ready

How to do it...

How it works...

5. Combining Twilio with Other APIs

Introduction

Searching for local businesses via text

Getting ready

How to do it...

How it works...

Getting the local weather forecast

Getting ready

How to do it...

How it works...

Searching for local movie listings

Getting ready

How to do it...

How it works...

Searching for classifieds

Getting ready...

How to do it...

How it works...

Getting local TV listings

Getting ready

How to do it...

How it works...

Searching Google using SMS

Getting ready

How to do it...

How it works

Searching the stock market

Getting ready

How to do it...

How it works...

Getting the latest headlines

Getting ready

How to do it...

How it works...

6. Sending and Receiving SMS Messages

Introduction

Sending a message from a website

Getting ready

How to do it...

How it works...

Replying to a message from the phone

Getting ready

How to do it...

How it works...

Forwarding SMS messages to another phone number

Getting ready

How to do it...

How it works...

Sending bulk SMS to a list of contacts

Getting ready

How to do it...

How it works...

Tracking orders with SMS

Getting Ready

How to do it...

How it works...

Sending and receiving group chats

Getting ready

How to do it...

How it works...

Sending SMS messages in a phone call

Getting ready

How to do it...

How it works...

Monitoring a website

Getting ready

How to do it...

How it works...

7. Building a Reminder System

Introduction

Scheduling reminders via text

Getting ready

How to do it…

How it works…

Getting notified when the time comes

Getting ready

How to do it…

How it works…

Retrieving a list of upcoming reminders

Getting ready

How to do it…

How it works…

Canceling an upcoming reminder

Getting ready

How to do it…

How it works…

Adding another person to a reminder

Getting ready

How to do it…

How it works…

8. Building an IVR System

Introduction

Setting up IVRs

Getting ready

How to do it…

How it works…

Screening and recording calls

Getting ready

How to do it…

How it works…

Logging and reporting calls

Getting ready

How to do it…

How it works…

Looking up HighriseHQ contacts on incoming calls

Getting ready

How to do it…

How it works…

Getting directions

Getting Ready

How to do it...

How it works…

Leaving a message

Getting Ready

How to do it...

How it works…

Sending an SMS to your Salesforce.com contacts

Getting Ready

How to do it...

How it works...

9. Building Your Own PBX

Introduction

Getting started with PBX

Getting ready

How to do it...

How it works...

Setting up a subaccount for each user

Getting ready

How to do it...

How it works...

Letting a user purchase a custom phone number

Getting ready

How to do it...

How it works...

Allowing users to make calls from their call logs

Getting ready

How to do it...

How it works...

Allowing incoming phone calls

Getting ready

How to do it...

How it works...

Allowing outgoing phone calls

Getting ready

How to do it...

How it works...

Deleting a subaccount

Getting ready

How to do it...

How it works...

10. Digging into OpenVBX

Introduction

Building a call log plugin

Getting ready

How to do it…

How it works…

Building a searchable company directory

Getting ready

How to do it…

How it works…

Collecting Stripe payments

Getting ready

How to do it…

How it works…

Tracking orders

Getting ready

How to do it…

How it works…

Building a caller ID routing plugin

Getting ready

How to do it…

How it works…

Testing call flows

Getting ready

How to do it…

How it works…

Index

Twilio Cookbook

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Twilio Cookbook

Copyright © 2013 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: September 2013

Production Reference: 1300813

Published by Packt Publishing Ltd.

Livery Place

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Birmingham B3 2PB, UK.

ISBN 978-1-78216-606-1

www.packtpub.com

Cover Image by Abhishek Pandey (<[e-mail]>)

Credits

Author

Roger Stringer

Reviewer

Jakir Hayder

Acquisition Editors

Rukhsana Khambatta

Sam Birch

Lead Technical Editor

Dayan Hyames

Technical Editors

Sharvari H. Baet

Jalasha D'costa

Dipika Gaonkar

Aparna Kumari

Copy Editors

Mradula Hegde

Gladson Monteiro

Aditya Nair

Laxmi Subramanian

Project Coordinator

Apeksha Chitnis

Proofreaders

Stephen Copestake

Maria Gould

Indexer

Hemangini Bari

Production Coordinator

Arvindkumar Gupta

Cover Work

Arvindkumar Gupta

About the Author

Roger Stringer has been a PHP developer since 2001 and has been working on projects of all sizes for companies all over the world. He has also formed several startups over the years and most of them have been powered by Twilio to provide services.

When not working on the Web, Roger can be found reading, cooking, and spending time with his daughter Kaitlyn at local farmers' markets.

Roger is the founder of The Interviewr, a Twilio-powered startup that makes interviewing more efficient by helping with scheduling, contact management, and conducting and recording interviews.

I'd like to thank my wife Patsy and our daughter Kaitlyn for having the patience to let me get this book written. There were many hours that I spent behind a computer typing.

Rob and the Twilio crew for answering any questions that came up as I worked on the various topics covered.

I also want to thank Jason and the crew at Copter Labs and Gary and the VeriCorder team.

About the Reviewer

Jakir Hayder graduated in Computer Science from South East University and is doing his MS in Computer Science and Engineering from North South University in Bangladesh. He has been building websites and social networking apps since 1999. He has been developing Facebook apps since 2007. He gave his talk at Facebook Developer Garage, Dhaka. He has developed websites with deep integration with Facebook, Twitter, LinkedIn, and YouTube APIs. He writes tests with RSpec, Cucumber, and Capybara with Selenium. He follows Agile methodologies of software development and is specially fond of scrum and standup.

Besides his full-time job, Jakir writes his blog at blog.jambura.com. He can be followed on Twitter @jakirhayder and on his LinkedIn profile bd.linkedin.com/in/zakirhyder. He lives in Bangladesh with his wife Fathema and his son Arham. Currently, Jakir is working as a Sr. Software Engineer at Cellbazaar, the biggest classified ads site in Bangladesh.

I'd like to thank my wife for taking care of my three-month old boy while I reviewed the book and did my job. I'd also like to thank Apeksha Chitnis for being patient with me.

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Preface

Phones are everywhere! From calling to texting, you use phones for your business and for personal use. Twilio provides an API that lets you combine phone calls and SMS messages with your websites.

Twilio Cookbook will get you on the fast lane to learning how to use Twilio with PHP and MySQL to add phone and SMS services to your websites; you'll also rapidly learn how to set up systems such as a company directory, PBX, a voicemail system, an order-tracking system, and finally how to set up two-factor authentication.

What this book covers

Chapter 1, Into the Frying Pan, covers what you need to know about adding two-factor authentication to a website to verify users. This chapter helps you set up a basic order-verification system, add the Click-to-Call functionality to a website, and record phone calls. We will also set up a company directory and learn how to use Twilio Client for Text-to-Speech.

Chapter 2, Now We're Cooking, begins by covering how to create usage records and then proceeds to topics such as screen calls to be actually answered by a person, buying a phone number, setting up a voicemail system, and building an emergency calling system.

Chapter 3, Conducting Surveys via SMS, builds a system that lets you add subscribers, build a survey, send surveys to subscribers, and view responses that come back.

Chapter 4, Building a Conference Calling System, shows you how to build a handy conference calling system that includes scheduling, notifying attendees, recording the conference call, joining the call from a browser or from a phone, monitoring the conference, and muting attendees.

Chapter 5, Combining Twilio with Other APIs, shows you how to use Twilio with other APIs to add features such as a local business search via text messages, a movie listings search, and a weather look-up. You'll also learn how to search Google.

Chapter 6, Sending and Receiving SMS Messages, digs into the many SMS messaging features that Twilio provides, beginning with sending messages from a website to replying to messages from a phone, sending bulk SMS messages to a list of people, SMS order tracking to check on orders, serving a group chat platform, and sending SMS messages from a phone call.

Chapter 7, Building a Reminder System, uses Twilio's SMS services to let you schedule reminders, get notifications of the reminders set, retrieve a list of reminders, cancel a reminder, and add another person to a reminder.

Chapter 8, Building an IVR System, shows you how to set up an Interactive Voice Response system, beginning with a basic phone tree, screening and recording calls, logging and reporting calls, looking up contacts on incoming calls using the HighRiseHQ API, and sending SMS messages to www.Salesforce.com contacts.

Chapter 9, Building Your Own PBX, shows you how to set up subaccounts for each of your users, letting them buy their own phone numbers, accept incoming phone calls, make outgoing phone calls, and delete their accounts.

Chapter 10, Digging into OpenVBX, takes you into the world of building plugins for the OpenVBX system, starting with a call log plugin, going into a searchable company directory, collecting payments over the phone using Stripe, tracking orders, setting up a caller ID system, and testing call flows.

What you need for this book

All you need to get started is a Twilio account, a web host, a simple text editor such as Notepad++, Emacs, or Vim, and an Internet connection.

Who this book is for

This book is for programmers who have already used PHP and MySQL in one way or another. It's for people who work with a lot of backend code and want to get up to speed with the world of Twilio. It's for people who want to use the capabilities of Twilio to let their websites handle phone calls and SMS messages.

The book is for both beginners and seasoned developers and assumes that you have some experience in PHP and MySQL already. In-depth knowledge of these applications is not necessary, however.

Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text are shown as follows: Create a file called search.php in your views folder.

A block of code is set as follows:

Choose a Twilio number to buy

available_phone_numbers as $number){ ?>

 

POST action=/buy>

  friendly_name ?>