Record Phone Calls in C#

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When a phone number you have bought through Twilio receives an incoming call, Twilio will send an HTTP request to your web application asking for instructions on how to handle the call. Your server will respond with an XML document containing TwiML that instructs Twilio on what to do with the call. Those instructions can direct Twilio to read out a message, play an MP3 file, make a recording and much more.

To start answering phone calls, you must:

• Buy and configure a Twilio-powered phone number capable of making and receiving phone calls, and point it at your web application
• Write a web application to tell Twilio how to handle the incoming call using TwiML
• Make your web application accessible on the Internet so Twilio can make an HTTP request when you receive a call

In the Twilio Console, you can search for and buy phone numbers in countries around the world. Numbers that have the Voice capability can make and receive voice phone calls from just about anywhere on the planet.

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Once you purchase a number, you'll need to configure that number to send a request to your web application. This callback mechanism is called a webhook. This can be done in the number's configuration page.

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Next, let's define a couple of the terms we're going to need to know.

Webhooks are user-defined HTTP callbacks. They are usually triggered by some event, such as receiving an SMS message or an incoming phone call. When that event occurs, Twilio makes an HTTP request (usually a POST or a GET) to the URL configured for the webhook.

To handle a webhook, you only need to build a small web application that can accept the HTTP requests. Almost all server-side programming languages offer some framework for you to do this. Examples across languages include ASP.NET MVC for C#, Servlets and Spark for Java, Express for Node.js, Django and Flask for Python, and Rails and Sinatra for Ruby. PHP has its own web app framework built in, although frameworks like Laravel, Symfony and Yii are also popular.

Whichever framework and language you choose, webhooks function the same for every Twilio application. They will make an HTTP request to a URI that you provide to Twilio. Your application performs whatever logic you feel necessary - read/write from a database, integrate with another API or perform some computation - then replies to Twilio with a TwiML response with the instructions you want Twilio to perform.

TwiML is the Twilio Markup Language, which is just to say that it's an XML document with special tags defined by Twilio to help you build your SMS and voice applications. TwiML is easier shown than explained. Here's some TwiML you might use to respond to an incoming phone call:

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<?xml version="1.0" encoding="UTF-8"?>
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<Response>
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    <Say>Thanks for calling!</Say>
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</Response>

And here's some TwiML you might use to respond to an incoming SMS message:

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<?xml version="1.0" encoding="UTF-8"?>
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<Response>
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    <Message>We got your message, thank you!</Message>
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</Response>

Every TwiML document will have the root <Response> element and within that can contain one or more verbs. Verbs are actions you'd like Twilio to take, such as <Say> a greeting to a caller, or send an SMS <Message> in reply to an incoming message. For a full reference on everything you can do with TwiML, refer to our TwiML API Reference.

Now comes the fun part - writing code that will handle an incoming HTTP request from Twilio!

In this example we'll use ASP.NET MVC to respond to Twilio's request and we'll use TwiML to tell Twilio how to handle the call.

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// In Package Manager, run:
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// Install-Package Twilio.AspNet.Mvc -DependencyVersion HighestMinor
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using System.Web.Mvc;
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using Twilio.AspNet.Mvc;
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using Twilio.TwiML;
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public class RecordController : TwilioController
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{
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    [HttpPost]
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    public ActionResult Index()
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    {
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        var response = new VoiceResponse();
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        // Use <Say> to give the caller some instructions
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        response.Say("Hello. Please leave a message after the beep.");
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        // Use <Record> to record the caller's message
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        response.Record();
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        // End the call with <Hangup>
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        response.Hangup();
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        return TwiML(response);
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    }
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}

Next, let's record an outbound call using Twilio and C#. First, we'll need to get the credentials for our Twilio account.

First, you'll need to get your Twilio account credentials. They consist of your AccountSid and your Auth Token. They can be found on the home page of the console.

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Just set the "Record" property to "true" on the "CallOptions" and Twilio will record the entire phone call.

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// Install the C# / .NET helper library from twilio.com/docs/csharp/install
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using System;
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using Twilio;
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using Twilio.Rest.Api.V2010.Account;
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using System.Threading.Tasks;
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class Program {
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    public static async Task Main(string[] args) {
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        // Find your Account SID and Auth Token at twilio.com/console
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        // and set the environment variables. See http://twil.io/secure
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        string accountSid = Environment.GetEnvironmentVariable("TWILIO_ACCOUNT_SID");
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        string authToken = Environment.GetEnvironmentVariable("TWILIO_AUTH_TOKEN");
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        TwilioClient.Init(accountSid, authToken);
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        var call = await CallResource.CreateAsync(
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            record: true,
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            url: new Uri("http://demo.twilio.com/docs/voice.xml"),
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            to: new Twilio.Types.PhoneNumber("+14155551212"),
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            from: new Twilio.Types.PhoneNumber("+15017122661"));
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        Console.WriteLine(call.Sid);
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    }
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}

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{
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  "account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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  "annotation": null,
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  "answered_by": null,
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  "api_version": "2010-04-01",
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  "caller_name": null,
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  "date_created": "Tue, 31 Aug 2010 20:36:28 +0000",
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  "date_updated": "Tue, 31 Aug 2010 20:36:44 +0000",
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  "direction": "inbound",
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  "duration": "15",
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  "end_time": "Tue, 31 Aug 2010 20:36:44 +0000",
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  "forwarded_from": "+141586753093",
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  "from": "+15017122661",
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  "from_formatted": "(415) 867-5308",
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  "group_sid": null,
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  "parent_call_sid": null,
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  "phone_number_sid": "PNaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
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  "price": "-0.03000",
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  "price_unit": "USD",
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  "sid": "CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
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  "start_time": "Tue, 31 Aug 2010 20:36:29 +0000",
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  "status": "completed",
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  "subresource_uris": {
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    "notifications": "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Calls/CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Notifications.json",
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    "recordings": "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Calls/CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Recordings.json",
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    "payments": "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Calls/CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Payments.json",
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    "events": "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Calls/CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Events.json",
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    "siprec": "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Calls/CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Siprec.json",
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    "streams": "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Calls/CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Streams.json",
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    "transcriptions": "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Calls/CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Transcriptions.json",
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    "user_defined_message_subscriptions": "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Calls/CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/UserDefinedMessageSubscriptions.json",
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    "user_defined_messages": "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Calls/CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/UserDefinedMessages.json"
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  },
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  "to": "+14155551212",
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  "to_formatted": "(415) 867-5309",
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  "trunk_sid": null,
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  "uri": "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Calls/CAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.json",
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  "queue_time": "1000"
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}

Once the call is complete, you can listen to your recordings in your Twilio Console or access them directly through Twilio's REST API.

You can also gain access to the recording as soon as the call is complete by setting the "StatusCallback" property in your "CallOptions". At the end of the call Twilio will send a request to the URL you specified, and that request will include a link to the recording's audio file.

You can learn more about the status callback in the Making Calls reference docs.

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