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Transfer a call

A code snippet that shows how to transfer control of the current call to control by a new NCCO.

Example

Replace the following variables in the example code:

Key Description
UUID The UUID of the call leg
NCCO_URL The URL of the NCCO to execute. URLs must be array type.

Prerequisites

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

Execute the following command at your terminal prompt to create the JWT for authentication:

export JWT=$(nexmo jwt:generate $PATH_TO_PRIVATE_KEY application_id=$NEXMO_APPLICATION_ID)

Write the code

Add the following to transfer-a-call.sh:

curl -X PUT https://api.nexmo.com/v1/calls/$UUID \
  -H "Authorization: Bearer "$JWT \
  -H "Content-Type: application/json"\
  -d '{"action": "transfer",
      "destination": {"type": "ncco", "url": ["https://developer.nexmo.com/ncco/tts.json"]}}'

View full source

Run your code

Save this file to your machine and run it:

bash transfer-a-call.sh

Prerequisites

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

npm install @vonage/server-sdk

Create a file named transfer-call.js and add the following code:

const Vonage = require('@vonage/server-sdk');

const vonage = new Vonage({
  apiKey: VONAGE_API_KEY,
  apiSecret: VONAGE_API_SECRET,
  applicationId: VONAGE_APPLICATION_ID,
  privateKey: VONAGE_PRIVATE_KEY
}, { debug: true });

View full source

Write the code

Add the following to transfer-call.js:

const NCCO_URL = "https://raw.githubusercontent.com/nexmo-community/ncco-examples/gh-pages/text-to-speech.json";

vonage.calls.update(UUID, {
  action: 'transfer',
  destination: {
    "type": "ncco",
    "url": [NCCO_URL]
  }
}, (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 transfer-call.js

Prerequisites

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

Add the following to `build.gradle`:

compile 'com.vonage:client:6.2.0'

Create a class named TransferCall and add the following code to the main method:

VonageClient client = VonageClient.builder()
        .applicationId(VONAGE_APPLICATION_ID)
        .privateKeyPath(VONAGE_PRIVATE_KEY_PATH)
        .build();

View full source

Write the code

Add the following to the main method of the TransferCall class:

/*
Establish a call for testing purposes.
 */
final String ANSWER_URL = "https://nexmo-community.github.io/ncco-examples/long-tts.json";
CallEvent call = client.getVoiceClient().createCall(new Call(
        TO_NUMBER,
        VONAGE_NUMBER,
        ANSWER_URL
));

/*
Give them time to answer.
 */
Thread.sleep(10000);

final String UUID = call.getUuid();
final String NCCO_URL = "https://nexmo-community.github.io/ncco-examples/talk.json";
client.getVoiceClient().transferCall(UUID, NCCO_URL);

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.vonage.quickstart.voice with the package containing TransferCall:

gradle run -Pmain=com.vonage.quickstart.voice.TransferCall

Prerequisites

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

Install-Package Vonage

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

using Vonage;
using Vonage.Request;
using Vonage.Voice;

View full source

Add the following to TransferCall.cs:

var credentials = Credentials.FromAppIdAndPrivateKeyPath(VONAGE_APPLICATION_ID, VONAGE_PRIVATE_KEY_PATH);
var client = new VonageClient(credentials);

View full source

Write the code

Add the following to TransferCall.cs:

var callEditCommand = new CallEditCommand()
{
    Action = CallEditCommand.ActionType.transfer,
    Destination = new Destination()
    {
        Url = new[] { NCCO_URL }
    }
};

var response = client.VoiceClient.UpdateCall(UUID, callEditCommand);

View full source

Prerequisites

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

composer require vonage/client

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

$keypair = new \Vonage\Client\Credentials\Keypair(
    file_get_contents(VONAGE_APPLICATION_PRIVATE_KEY_PATH),
    VONAGE_APPLICATION_ID
);

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

View full source

Write the code

Add the following to index.php:

$call = $client->voice()->get(UUID);
$client->voice()->transferCall(
    $call->getUuid(),
    new \Vonage\Voice\NCCO\Action\Transfer("https://raw.githubusercontent.com/nexmo-community/ncco-examples/gh-pages/transfer.json")
);

View full source

Run your code

Save this file to your machine and run it:

php index.php

Prerequisites

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

pip install vonage

Create a file named transfer-a-call.py and add the following code:

client = vonage.Client(
    application_id=VONAGE_APPLICATION_ID,
    private_key=VONAGE_APPLICATION_PRIVATE_KEY_PATH,
)

View full source

Write the code

Add the following to transfer-a-call.py:

voice = vonage.Voice(client)

dest = {"type": "ncco", "url": ["https://raw.githubusercontent.com/nexmo-community/ncco-examples/gh-pages/text-to-speech.json"]}
response = voice.update_call(UUID, action="transfer", destination=dest)
pprint(response)

View full source

Run your code

Save this file to your machine and run it:

python3 transfer-a-call.py

Prerequisites

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

gem install vonage

Create a file named transfer-a-call.rb and add the following code:


client = Vonage::Client.new(
  application_id: VONAGE_APPLICATION_ID,
  private_key: File.read(VONAGE_APPLICATION_PRIVATE_KEY_PATH)

View full source

Write the code

Add the following to transfer-a-call.rb:


ncco = {"type": "ncco", "url": ["https://raw.githubusercontent.com/nexmo-community/ncco-examples/gh-pages/transfer.json"]}

response = client.voice.transfer(UUID, destination: ncco)

View full source

Run your code

Save this file to your machine and run it:

ruby transfer-a-call.rb

Try it out

You will need to:

  1. Set up a call and obtain the call UUID. You could use the 'connect an inbound call' code snippet to do this.
  2. Run the example code to transfer the call.
  3. Control will be transferred to a new NCCO, and you will hear a text-to-speech message to confirm this.