Play text-to-speech into a call
This code snippet plays a text-to-speech message into the specified call.
Prerequisites
Create an Application
You can install the CLI with the following command:
Before you can start working with your apps, you need to register your configuration: API Key and Secret. You can find them via the Dashboard, in API Settings. Once set, initialize your account using the following command:
As soon as the CLI is both installed and configured, use it to create a Vonage application using the following command:
The command starts an interactive prompt to ask for the application name, and the capabilities you want to enable - make sure to enable Voice.
When finished, it creates the vonage_app.json file in the current directory containing the Application ID, Application name and private key. It also creates a second file with the private key name app_name.key.
Go to the Application's page on the Dashboard, and define a Name for your Application.
Make sure to click on the Generate public and private key button, and keep the file private.key around.
Then, enable the Voice capability. For the moment, leave everything by default.
Finally, click Save at the bottom of the page.
Rent a Number
You can rent a number using the Vonage CLI. The following command purchases an available number in the United States:
Specify an alternative two-character country code to purchase a number in another country.
In the Dashboard, go to the Buy Numbers page. Make sure to tick Voice in the search filter, and select the country you want to buy a number in.
You can then click the Buy button next to the number you want, and validate your purchase.
Congratulations! Your virtual number is now listed in Your Numbers
Link a Number
Now that you have both an application and a number, you need to link them together.
Replace YOUR_VONAGE_NUMBER with the number you bought and APPLICATION_ID with your application id, then run the following command:
Now that you have both an application and a number, you need to link them together.
Go to the Application page, and click on the application you created earlier.
In the Voice section, click on the Link button next to the number you want to link.
Example
Replace the following variables in the example code:
| Key | Description |
|---|---|
UUID | The UUID of the call leg. |
TEXT | The text of the message to play into the call. |
LANGUAGE | Language to use for the speech - see Supported Languages. |
Prerequisites
Execute the following command at your terminal prompt to create the JWT for authentication:
Run your code
Save this file to your machine and run it:
Prerequisites
Create a file named play-tts-into-call.js and add the following code:
Run your code
Save this file to your machine and run it:
Prerequisites
Add the following to build.gradle:
Create a file named PlayTextToSpeechIntoCall and add the following code to the main method:
Write the code
Add the following to the main method of the PlayTextToSpeechIntoCall file:
Run your code
We can use the application plugin for Gradle to simplify the running of our application. Update your build.gradle with the following:
Run the following gradle command to execute your application, replacing com.vonage.quickstart.kt.voice with the package containing PlayTextToSpeechIntoCall:
Prerequisites
Add the following to build.gradle:
Run your code
We can use the application plugin for Gradle to simplify the running of our application. Update your build.gradle with the following:
Run the following gradle command to execute your application, replacing com.vonage.quickstart.voice with the package containing SendTalkToCall:
Prerequisites
Prerequisites
Run your code
Save this file to your machine and run it:
Prerequisites
Run your code
Save this file to your machine and run it:
Prerequisites
Run your code
Save this file to your machine and run it:
Try it out
When you run the code a text-to-speech message is played into the call identified with the specified UUID.
Further Reading
- Conference Calling - This guide explains the two concepts Vonage associates with a call, a leg and a conversation.