Stranded aliens can call a phone number and receive instructions on how to get out of earth safely, or call their home planet directly. In this tutorial, we'll show you the key bits of code to make this work.
To run this sample app yourself, download the code and follow the instructions on GitHub.
To initiate the phone tree, we need to configure one of our Twilio numbers to send our web application an HTTP request when we get an incoming call.
Click on one of your numbers and configure the Voice URL to point to our app. In our code the route will be
If you don't already have a server configured to use as your webhook, ngrok is a great tool for testing webhooks locally.
With our Twilio number configured, we are prepared to respond to the Twilio request.
After playing the audio and retrieving the caller's input, Twilio will send this input to our application.
action parameter takes an absolute or relative URL as a value. In our case, this is the
When the caller has finished entering digits, Twilio will make a GET or POST request to this URL that includes a
Digits parameter with the number our caller chose.
After making this request, Twilio will continue the current call using the TwiML received in your response. Any TwiML verbs occurring after a
<Gather> are unreachable, unless the caller enters no digits.
Now that we have told Twilio where to send the caller's input, we can look at how to process that input.
If the caller chooses '2' to call their home planet, we need to gather more input from them. We'll cover this in the next step.
If the caller enters anything else, we respond with a TwiML
Redirect to the main menu.
If the caller chooses '2', we will take them to the Planet Directory in order to collect more input.
If our callers choose to call their home planet, we will read them the planet directory. This is similar to a typical "company directory" feature of most IVRs.
In our TwiML response we again use a
Gather verb to collect our caller's input. This time, the
action verb points to the
planets route, which will switch our response based on what the caller chooses.
Again we show some options to the caller and instruct Twilio to collect the caller's choice.
In this servlet, we grab the caller's selection from the request and store it in a variable called
selectedOption. We then use a
Dial verb with the appropriate phone number to connect our caller to the correct home planet.
The current numbers are hard coded, but they could also be read from a database or from a file.
That's it! We've just implemented an IVR phone tree that will delight and serve your customers.
If you're a Java developer working with Twilio, you might enjoy these other tutorials:
Automated Survey (Spark)
Instantly collect structured data from your users with a survey conducted over a voice call or SMS text messages.
Click-to-call enables your company to convert web traffic into phone calls with the click of a button.
Thanks for checking out this tutorial! If you have any feedback to share with us, we'd love to hear it. Connect with us on Twitter and let us know what you build!