Record a call with split audio

A building block that shows how to record a call with split audio. The call to be recorded is identified via a UUID.

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 Split Audio Example"  http://demo.ngrok.io/webhooks/events --keyfile private.key
Install dependencies

Add the following to build.gradle:

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

Write the code

Add the following to RecordCallSplitAudio.java:

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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());

    RecordNcco record = new RecordNcco();
    record.setEventUrl(recordingUrl);
    record.setSplit(SplitRecording.CONVERSATION);

    ConnectNcco connect = new ConnectNcco(TO_NUMBER);
    connect.setFrom(NEXMO_NUMBER);

    Ncco[] nccos = new Ncco[]{record, connect};

    res.type("application/json");

    // com.fasterxml.jackson.databind.ObjectMapper;
    return new ObjectMapper().writer().writeValueAsString(nccos);
};

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

    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 RecordCallSplitAudio:

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

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 Split Audio Example"  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->get('/webhooks/answer', function (Request $request, Response $response) {
    $uri = $request->getUri();
    $ncco = [
        [
            'action' => 'record',
            'split' => 'conversation',
            '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 Split Audio Example"  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-with-split-audio.py and add the following code:

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

app = Flask(__name__)

View full source 

Write the code

Add the following to record-a-call-with-split-audio.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",
            "split" : "conversation",
            "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-with-split-audio.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 Split Audio Example"  http://demo.ngrok.io/webhooks/events --keyfile private.key
Install dependencies

$ gem install sinatra
Initialize your dependencies

Create a file named record-a-call-with-split-audio.rb and add the following code:

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before do
  content_type :json
end

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

View full source 

Write the code

Add the following to record-a-call-with-split-audio.rb:

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route :get, :post, '/webhooks/answer' do
    [
        {
          "action": "record",
          "split": "conversation",
          "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-with-split-audio.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' building block to do this.
  2. Record the call with split audio (this building block).
  3. Download the recording. See the 'Download a recording' building block for how to do this.