You can quickly see how the Voice API works by calling yourself using the Voice SDK.
In this guide you will learn:
Before you can get started, you need the following already set up:
- Set all Voice API configuration settings.
- ASP.NET Core 6.0 or later SDK and ASP.NET Core Runtime and a familiarity with how to create an app.
Create a new project folder and open a command prompt. Execute the following command to create a new ASP.NET Core 6.0 console application:
dotnet new console
This creates a new web API application and project. Now add the Sinch Voice SDK. Run the following command:
dotnet add package Sinch.ServerSdk
The Voice SDK lets you use the Voice API with far fewer lines of code than you'd otherwise need.
In your project folder, open the Program.cs file and paste the provided "Program.cs" code into the file, replacing all the existing content.
Make a phone call
// Find your application key and secret at dashboard.sinch.com/voice/apps // Find your Sinch numbers at dashboard.sinch.com/numbers/your-numbers/numbers using Sinch.ServerSdk; using Sinch.ServerSdk.Models; string key = "MyAppKey"; string secret = "MyAppSecret"; string to = "MyToNumber"; string fromNumber = "MyFromNumber"; var calloutApi = SinchFactory .CreateApiFactory(key, secret, Locale.EnUs) .CreateCalloutApi(); var calloutResponse = await calloutApi .TtsCallout( to, "Hello, this is a call from Sinch. Congratulations! You made your first call.", fromNumber) .Call();
This code makes text-to-speech callout to a specified number using the Sinch Voice SDK.
toparameter to the phone number you verified in your dashboard in E.164 format.
When your account is in trial mode, you can only call your verified numbers. If you want to call any number, you need to upgrade your account!
Before you can run the code, you need to update some more values so you can connect to your Sinch account. Update the following parameters with your own values:
|The application key found on your Sinch dashboard. Click on your application to find the key.|
|The application secret found on your Sinch dashboard. Click on your application to fine the secret.|
|Any number you've assigned to your application. This can be a number you've purchased or your free test number. Find the number on your Sinch dashboard by clicking on your app and looking in the Inbound Numbers section.|
Save the file.
Before executing your code, you must first compile your application. Execute the following command:
Now you can execute the code and make your text-to-speech call. Run the following command:
You should receive a phone call to the number you called with the message "Hello, this is a call from Sinch. Congratulations! You made your first call."
If after running your app you receive a 5000 error response, you may have forgotten to save your file after adding your authentication values. This is an easy mistake to make! Try saving the file and running the app again.
Now that you know how to make a call, learn how to handle an incoming call.