testnumber.org

Test a Phone Number's Interoperability, Caller Id, Reputation, and STIR/SHAKEN Attestation Level

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How to create a Phone Service that will detect and repeat the Caller-Id

Login into Twilio’s Console and buy a Phone Number

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• Log in to the Twilio Console
• Navigate toProducts > Super Network > Phone Numbers > Manage > Buy a number

Buy a Twilio Number

Verify the purchased Number

Create a Twilio Function

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• This Service Function will be configured to be called on every inbound call

Find Twilio Functions and Assets in the Console

Create a new Service called incoming-number-detector

Create a new Function in the incoming-number-detector Service called /main

Paste the following javascript in the Editor for the /main Function.

  exports.handler = function(context, event, callback) {  
    let twiml = new Twilio.twiml.VoiceResponse();        
    let fromNumber = event["Caller"]; // The From number is contained in this key 
    let speechFriendlyFromNumber = fromNumber.slice(1).split("").join(" "); // Format it better for speech

    // Add a few cosmetic pauses
    twiml.pause({
      length: 2
    });

    twiml.say({ voice: "alice" }, "Welcome to test number dot org.");

    twiml.pause({
      length: 1
    });

    // Tell the caller what we have detected as the From Number
    twiml.say({ voice: "alice" }, "You are calling from " + speechFriendlyFromNumber + ".");

    twiml.pause({
      length: 1
    });

    // Bid them farewell
    twiml.say({ voice: "alice" }, "Goodbye.");

    return callback(null, twiml);
  };    

• Save /main
• Press Deploy All at the bottom of the Editor

Configure the Phone Number

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Enable the Function for incoming calls to the new Number

Verify the Function is the default for the new Number

Call your new Phone Number

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• Dial the Phone Number from a working telephone
• You should hear your Caller ID repeated back to you
• We’ll cover debugging in another session