Play text-to-speech into a call

This building block plays a text-to-speech message into the specified call.

Example

Replace the following variables in the example code:

Key Description
UUID the UUID of the call into which to play the text-to-speech message.
Text text of the message to play into the call.

Prerequisites

Use your existing application

Modifying an existing call requires that the UUID provided is a currently active call. To modify a call, you must use the same NEXMO_APPLICATION_ID and private key that were used to create the call.

Write the code

Add the following to play-tts-into-a-call.sh:

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curl -X PUT https://api.nexmo.com/v1/calls/$UUID/talk\
  -H "Authorization: Bearer "$JWT\
  -H "Content-Type: application/json"\
  -d '{"text": "Hello, hi there"}'

View full source 

Run your code

Save this file to your machine and run it:

$ bash play-tts-into-a-call.sh

Prerequisites

Use your existing application

Modifying an existing call requires that the UUID provided is a currently active call. To modify a call, you must use the same NEXMO_APPLICATION_ID and private key that were used to create the call.

Install dependencies

$ npm install nexmo dotenv
Initialize your dependencies

Create a file named app.js and add the following code:

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const Nexmo = require('nexmo');

const nexmo = new Nexmo({
  apiKey: NEXMO_API_KEY,
  apiSecret: NEXMO_API_SECRET,
  applicationId: NEXMO_APPLICATION_ID,
  privateKey: NEXMO_PRIVATE_KEY
}, {debug: true});

View full source 

Write the code

Add the following to app.js:

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const TEXT = 'This is some sample text to speech text. It could go on and on and never end.';

nexmo.calls.talk.start(CALL_UUID, { text: TEXT, voiceName: 'Emma', loop: 0 }, (err, res) => {
  if(err) { console.error(err); }
  else {
      console.log(res);
  }
});

View full source 

Run your code

Save this file to your machine and run it:

$ node app.js

Prerequisites

Use your existing application

Modifying an existing call requires that the UUID provided is a currently active call. To modify a call, you must use the same NEXMO_APPLICATION_ID and private key that were used to create the call.

Install dependencies

Add the following to build.gradle:

compile 'com.nexmo:client:latest.release'
Initialize your dependencies

Create a file named SendTalkToCall.java and add the following code:

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AuthMethod auth = new JWTAuthMethod(NEXMO_APPLICATION_ID, FileSystems.getDefault().getPath(NEXMO_PRIVATE_KEY));
NexmoClient nexmo = new NexmoClient(auth);

View full source 

Write the code

Add the following to SendTalkToCall.java:

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nexmo.getVoiceClient().startTalk(UUID, TEXT, VoiceName.KIMBERLY, 0);

View full source 

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:

apply plugin: 'application'
mainClassName = project.hasProperty('main') ? project.getProperty('main') : ''

Run the following gradle command to execute your application, replacing com.nexmo.quickstart.voice with the package containing SendTalkToCall:

gradle run -Pmain=com.nexmo.quickstart.voice.SendTalkToCall

Prerequisites

Use your existing application

Modifying an existing call requires that the UUID provided is a currently active call. To modify a call, you must use the same NEXMO_APPLICATION_ID and private key that were used to create the call.

Install dependencies

$ Install-Package Nexmo.Csharp.Client
Initialize your dependencies

Create a file named VoiceController.cs and add the following code:

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var client = new Client(creds: new Nexmo.Api.Request.Credentials
{
    ApiKey = "NEXMO_API_KEY",
    ApiSecret = "NEXMO_API_SECRET",
    ApplicationId = "NEXMO_APPLICATION_ID",
    ApplicationKey = "NEXMO_APPLICATION_PRIVATE_KEY"
});

View full source 

Write the code

Add the following to VoiceController.cs:

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var result = Client.Call.BeginTalk(NEXMO_CALL_UUID, new Call.TalkCommand
{
    text = TEXT,
    voice_name = "Kimberly"
});

View full source 

Run your code

Save this file to your machine and run it:

$ Run using your IDE

Prerequisites

Use your existing application

Modifying an existing call requires that the UUID provided is a currently active call. To modify a call, you must use the same NEXMO_APPLICATION_ID and private key that were used to create the call.

Install dependencies

$ composer require nexmo/client
Initialize your dependencies

Create a file named index.php and add the following code:

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$keypair = new \Nexmo\Client\Credentials\Keypair(
    file_get_contents(NEXMO_APPLICATION_PRIVATE_KEY_PATH),
    NEXMO_APPLICATION_ID
);

$client = new \Nexmo\Client($keypair);

View full source 

Write the code

Add the following to index.php:

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$talk = $client->calls[UUID]->talk();
$talk->setText(TEXT);
$talk->setVoiceName('Kimberly');
$talk->put();

View full source 

Run your code

Save this file to your machine and run it:

$ php index.php

Prerequisites

Use your existing application

Modifying an existing call requires that the UUID provided is a currently active call. To modify a call, you must use the same NEXMO_APPLICATION_ID and private key that were used to create the call.

Install dependencies

$ pip install nexmo
Initialize your dependencies

Create a file named play-tts-into-call.py and add the following code:

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import nexmo


client = nexmo.Client(
    application_id=APPLICATION_ID,
    private_key=APPLICATION_PRIVATE_KEY_PATH,
)

View full source 

Write the code

Add the following to play-tts-into-call.py:

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client.send_speech(NEXMO_CALL_UUID, text='Hello from Nexmo')

View full source 

Run your code

Save this file to your machine and run it:

$ python3 play-tts-into-call.py

Prerequisites

Use your existing application

Modifying an existing call requires that the UUID provided is a currently active call. To modify a call, you must use the same NEXMO_APPLICATION_ID and private key that were used to create the call.

Install dependencies

$ gem install sinatra
Initialize your dependencies

Create a file named play-text-to-speech-into-a-call.rb and add the following code:

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require 'nexmo'

client = Nexmo::Client.new(
    application_id: NEXMO_APPLICATION_ID,
    private_key: File.read(NEXMO_APPLICATION_PRIVATE_KEY_PATH)
)

View full source 

Write the code

Add the following to play-text-to-speech-into-a-call.rb:

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response = client.calls.talk.start(UUID, text: 'Hello from Nexmo', voice_name: "Kimberly")

View full source 

Run your code

Save this file to your machine and run it:

$ ruby play-text-to-speech-into-a-call.rb

Try it out

When you run the code a text-to-speech message is played into the call identified with the specified UUID.