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Connect callers to a conference

This code snippet shows how to join multiple calls into a conversation.

Multiple inbound calls can be joined into a conversation (conference call) by simply connecting the call into the same named conference.

Conference names are scoped at the Nexmo Application level. For example, NexmoApp1 and NexmoApp2 could both have a conference called nexmo-conference and there would be no problem.

Example

Replace the following variables in the example code:

Key Description
CONF_NAME The named identifier for your conference
  • Node.js
  • Java
  • .NET
  • PHP
  • Python
  • Ruby

    • 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 "Conference Call Example" http://demo.ngrok.io/webhooks/answer http://demo.ngrok.io/webhooks/events --keyfile private.key
    Install dependencies

    npm install express body-parser
    Initialize your dependencies

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

    Copy to Clipboard 
    const app = require('express')()
const bodyParser = require('body-parser')

app.use(bodyParser.json())

    View full source

    Write the code

    Add the following to conference-call.js:

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    const onInboundCall = (request, response) => {
  const ncco = [
    {
      action: 'talk',
      text: 'Please wait while we connect you to the conference'
    },
    {
      action: 'conversation',
      name: CONF_NAME
    }
  ]

  response.json(ncco)
}

app.get('/webhooks/answer', onInboundCall)

app.listen(3000)

    View full source

    Run your code

    Save this file to your machine and run it: 

    node conference-call.js

    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 "Conference 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:5.2.1'
    compile 'com.sparkjava:spark-core:2.7.2'

    Write the code

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

    Copy to Clipboard 
    /*
 * Route to answer incoming calls with an NCCO response.
 */
Route answerRoute = (req, res) -> {
    TalkAction intro = TalkAction.builder("Please wait while we connect you to the conference.").build();
    ConversationAction conversation = ConversationAction.builder(CONF_NAME).build();

    res.type("application/json");

    return new Ncco(intro, conversation).toJson();
};

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

    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 ConferenceCall:

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

    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 "Conference Call Example" http://demo.ngrok.io/webhooks/answer http://demo.ngrok.io/webhooks/events --keyfile private.key
    Install dependencies

    Install-Package Nexmo.Csharp.Client
    Import dependencies

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

    Copy to Clipboard 
    using Nexmo.Api.Voice.Nccos;

    View full source

    Write the code

    Add the following to ConnectCallersToConferenceController.cs:

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    [HttpGet("webhooks/answer")]
public string Answer()
{
    var CONF_NAME = Environment.GetEnvironmentVariable("CONF_NAME") ?? "CONF_NAME";
    var talkAction = new TalkAction() { Text = "Please wait while we connect you to the conference" };
    var conversationAction = new ConversationAction() { Name = CONF_NAME };
    var ncco = new Ncco(talkAction, conversationAction);
    return ncco.ToString();
}

    View full source

    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 "Conference Call Example" http://demo.ngrok.io/webhooks/answer http://demo.ngrok.io/webhooks/events --keyfile private.key
    Install dependencies

    composer require nexmo/client
    Initialize your dependencies

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

    Copy to Clipboard 
    use \Psr\Http\Message\ResponseInterface as Response;

require 'vendor/autoload.php';

$app = new \Slim\App;

    View full source

    Write the code

    Add the following to index.php:

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    $app->get('/webhooks/answer', function (Request $request, Response $response) {
    $ncco = [
        [
            'action' => 'talk',
            'text' => 'Hi, welcome to this Nexmo conference call.'
        ],
        [
            'action' => 'conversation',
            'name' => 'nexmo-conference-standard'
        ]
    ];

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

    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 "Conference 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 connect-callers-to-a-conference.py and add the following code:

    Copy to Clipboard 
    from flask import Flask, request, jsonify

app = Flask(__name__)

    View full source

    Write the code

    Add the following to connect-callers-to-a-conference.py:

    Copy to Clipboard 
    @app.route("/webhooks/answer")
def answer_call():
    ncco = [
        {
            "action": "talk",
            "text": "Please wait while we connect you to the conference"
        },
        {
            "action": "conversation",
            "name": CONF_NAME
        }]
    return jsonify(ncco)


if __name__ == '__main__':
    app.run(port=3000)

    View full source

    Run your code

    Save this file to your machine and run it: 

    python3 connect-callers-to-a-conference.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 "Conference Call Example" http://demo.ngrok.io/webhooks/answer http://demo.ngrok.io/webhooks/events --keyfile private.key
    Install dependencies

    gem install sinatra sinatra-contrib
    Initialize your dependencies

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

    Copy to Clipboard 
    require 'sinatra'
require 'sinatra/multi_route'
require 'json'

before do
  content_type :json
end

    View full source

    Write the code

    Add the following to join_a_conference_call.rb:

    Copy to Clipboard 
    route :get, :post, '/webhooks/answer' do
  [
    {
      action: 'talk',
      text: 'Welcome to a Nexmo powered conference call'
    },
    {
      action: 'conversation',
      name: 'room-name'
    }
  ].to_json
end

set :port, 3000

    View full source

    Run your code

    Save this file to your machine and run it: 

    ruby join_a_conference_call.rb

    Try it out

    Start your server and make multiple inbound calls to the Nexmo Number assigned to this Nexmo Application. The inbound calls will be connected into the same conversation (conference).