Record a call

A building blocks that shows how to answer an incoming call and set it up to record, then connect the call. When the call is completed, the eventUrl you specify in the record action of the NCCO will receive a webhook including the URL of the recording for download.

Example

Replace the following variables in the example code:

Key Description
NEXMO_NUMBER The Nexmo Number of the application (the FROM number).
TO_NUMBER The number to connect the call to.

Prerequisites

Create an application

A Nexmo application contains the required configuration for your project. You can create an application using the Nexmo CLI (see below) or via the dashboard. To learn more about applications see our Nexmo concepts guide.

Install the CLI

$ npm install -g nexmo-cli

Create an application

Once you have the CLI installed you can use it to create a Nexmo application. Run the following command and make a note of the application ID that it returns. This is the value to use in NEXMO_APPLICATION_ID in the example below. It will also create private.key in the current directory which you will need in the Initialize your dependencies step

Nexmo needs to connect to your local machine to access your answer_url. We recommend using ngrok to do this. Make sure to change demo.ngrok.io in the examples below to your own ngrok URL.

$ nexmo app:create "Record Call Example" http://demo.ngrok.io/webhooks/answer http://demo.ngrok.io/webhooks/events --keyfile private.key
Install dependencies

Add the following to build.gradle:

compile 'com.nexmo:client:4.0.0'
compile 'com.sparkjava:spark-core:2.7.2'

Write the code

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

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/*
 * Route to answer and connect incoming calls with recording.
 */
Route answerRoute = (req, res) -> {
    String recordingUrl = String.format("%s://%s/webhooks/recordings", req.scheme(), req.host());

    RecordAction record = new RecordAction.Builder().eventUrl(recordingUrl).build();

    ConnectAction connect = new ConnectAction.Builder(new PhoneEndpoint.Builder(TO_NUMBER).build())
            .from(NEXMO_NUMBER)
            .build();

    res.type("application/json");

    return new Ncco(record, connect).toJson();
};

/*
 * Route which prints out the recording URL it is given to stdout.
 */
Route recordingRoute = (req, res) -> {
    System.out.println(RecordEvent.fromJson(req.body()).getUrl());

    res.status(204);
    return "";
};

Spark.port(3000);
Spark.get("/webhooks/answer", answerRoute);
Spark.post("/webhooks/recordings", recordingRoute);

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 RecordCall:

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

Prerequisites

Create an application

A Nexmo application contains the required configuration for your project. You can create an application using the Nexmo CLI (see below) or via the dashboard. To learn more about applications see our Nexmo concepts guide.

Install the CLI

$ npm install -g nexmo-cli

Create an application

Once you have the CLI installed you can use it to create a Nexmo application. Run the following command and make a note of the application ID that it returns. This is the value to use in NEXMO_APPLICATION_ID in the example below. It will also create private.key in the current directory which you will need in the Initialize your dependencies step

Nexmo needs to connect to your local machine to access your answer_url. We recommend using ngrok to do this. Make sure to change demo.ngrok.io in the examples below to your own ngrok URL.

$ nexmo app:create "Record Call Example" http://demo.ngrok.io/webhooks/answer http://demo.ngrok.io/webhooks/events --keyfile private.key
Install dependencies

$ composer require slim/slim:^3.8

Write the code

Add the following to index.php:

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$app = new \Slim\App;

$app->get('/webhooks/answer', function (Request $request, Response $response) {
    $uri = $request->getUri();
    $ncco = [
        [
            'action' => 'record',
            'eventUrl' => [
                $uri->getScheme().'://'.$uri->getHost().':'.$uri->getPort().'/webhooks/recording'
            ]
        ],
        [
            'action' => 'connect',
            'from' => NEXMO_NUMBER,
            'endpoint' => [
                [
                    'type' => 'phone',
                    'number' => TO_NUMBER
                ]
            ]
        ],

    ];

    return $response->withJson($ncco);
});

$app->post('/webhooks/recording', function (Request $request, Response $response) {
    $params = $request->getParsedBody();
    error_log($params['recording_url']);
    return $response->withStatus(204);
});

$app->run();

View full source

Run your code

Save this file to your machine and run it:

$ php index.php

Prerequisites

Create an application

A Nexmo application contains the required configuration for your project. You can create an application using the Nexmo CLI (see below) or via the dashboard. To learn more about applications see our Nexmo concepts guide.

Install the CLI

$ npm install -g nexmo-cli

Create an application

Once you have the CLI installed you can use it to create a Nexmo application. Run the following command and make a note of the application ID that it returns. This is the value to use in NEXMO_APPLICATION_ID in the example below. It will also create private.key in the current directory which you will need in the Initialize your dependencies step

Nexmo needs to connect to your local machine to access your answer_url. We recommend using ngrok to do this. Make sure to change demo.ngrok.io in the examples below to your own ngrok URL.

$ nexmo app:create "Record Call Example" http://demo.ngrok.io/webhooks/answer http://demo.ngrok.io/webhooks/events --keyfile private.key
Install dependencies

$ pip install 'flask>=1.0'
Initialize your dependencies

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

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from flask import Flask, request, jsonify
from pprint import pprint

app = Flask(__name__)

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Write the code

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

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@app.route("/webhooks/answer")
def answer_call():
    ncco = [
        {
            "action": "talk",
            "text": "Hi, we will shortly forward your call. This call is recorded for quality assurance purposes."
        },
        {
            "action": "record",
            "eventUrl": ["https://demo.ngrok.io/webhooks/recordings"]
        },
        {
            "action": "connect",
            "eventUrl": ["https://demo.ngrok.io/webhooks/event"],
            "from": "NEXMO_NUMBER",
            "endpoint": [
                {
                    "type": "phone",
                    "number": "RECIPIENT_NUMBER"
                }
            ]
        }
    ]
    return jsonify(ncco)

@app.route("/webhooks/recordings", methods=['POST'])
def recordings():
    data = request.get_json()
    pprint(data)
    return "webhook received"

View full source

Run your code

Save this file to your machine and run it:

$ python3 record-a-call.py

Prerequisites

Create an application

A Nexmo application contains the required configuration for your project. You can create an application using the Nexmo CLI (see below) or via the dashboard. To learn more about applications see our Nexmo concepts guide.

Install the CLI

$ npm install -g nexmo-cli

Create an application

Once you have the CLI installed you can use it to create a Nexmo application. Run the following command and make a note of the application ID that it returns. This is the value to use in NEXMO_APPLICATION_ID in the example below. It will also create private.key in the current directory which you will need in the Initialize your dependencies step

Nexmo needs to connect to your local machine to access your answer_url. We recommend using ngrok to do this. Make sure to change demo.ngrok.io in the examples below to your own ngrok URL.

$ nexmo app:create "Record Call Example" http://demo.ngrok.io/webhooks/answer http://demo.ngrok.io/webhooks/events --keyfile private.key
Install dependencies

$ gem install sinatra
Initialize your dependencies

Create a file named record_a_call.rb and add the following code:

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require 'sinatra'
require 'sinatra/multi_route'
require 'json'

before do
  content_type :json
end

helpers do
  def parsed_body
    JSON.parse(request.body.read)
  end
end

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Write the code

Add the following to record_a_call.rb:

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route :get, :post, '/webhooks/answer' do
  [
    {
      "action": "record",
      "eventUrl": ["#{request.base_url}/webhooks/recordings"]
    },
    {
      "action": "connect",
      "from": NEXMO_NUMBER,
      "endpoint": [
        {
          "type": "phone",
          "number": TO_NUMBER
        }
      ]
    }
  ].to_json
end

route :get, :post, '/webhooks/recordings' do
  recording_url = params['recording_url'] || parsed_body['recording_url']
  puts "Recording URL = #{recording_url}"

  halt 204
end

set :port, 3000

View full source

Run your code

Save this file to your machine and run it:

$ ruby record_a_call.rb

Try it out

You will need to:

  1. Answer and record the call (this building block).
  2. Download the recording. See the Download a recording building block for how to do this.