Play DTMF into a call

This building block plays DTMF tones 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 DTMF tones.
Digits Digits representing the DTMF tones that will be played 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-dtmf-into-a-call.sh:

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curl -X PUT https://api.nexmo.com/v1/calls/$UUID/dtmf \
  -H "Authorization: Bearer "$JWT\
  -H "Content-Type: application/json"\
  -d '{"digits": 1713}'

View full source 

Run your code

Save this file to your machine and run it:

$ bash play-dtmf-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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nexmo.calls.dtmf.send(CALL_UUID, { digits: '1234567890' }, (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 SendDtmfToCall.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 SendDtmfToCall.java:

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nexmo.getVoiceClient().sendDtmf(UUID, DIGITS);

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 SendDtmfToCall:

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

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.SendDtmf(NEXMO_CALL_UUID, new Call.DtmfCommand
{
    digits= DIGITS
});

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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$dtmf = $client->calls[UUID]->dtmf();
$dtmf->setDigits('2468#');
$dtmf->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-dtmf-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-dtmf-into-call.py:

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client.send_dtmf(NEXMO_CALL_UUID, digits='1234')

View full source 

Run your code

Save this file to your machine and run it:

$ python3 play-dtmf-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 nexmo
Initialize your dependencies

Create a file named play-dtmf-into-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-dtmf-into-call.rb:

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DIGITS = '332393'
response = client.calls.dtmf.send(UUID, digits: DIGITS)

View full source 

Run your code

Save this file to your machine and run it:

$ ruby play-dtmf-into-call.rb

Try it out

When you run the code a series of DTMF tones is played into the call identified with the specified UUID.