Voice API Quickstart

Get started with Plivo Voice in minutes. This guide walks you through making your first outbound call and receiving incoming calls.

Prerequisites

Before you begin:

Sign up for a Plivo account (free trial includes credits)
Note your Auth ID and Auth Token from the console dashboard
Rent a phone number for receiving calls

Install the SDK

pip install plivo

For web framework support, also install Flask:

pip install flask

npm install plivo

For web server support, also install Express:

npm install express

gem install plivo sinatra

composer require plivo/plivo-php

Add to your pom.xml:

<dependency>
  <groupId>com.plivo</groupId>
  <artifactId>plivo-java</artifactId>
  <version>5.9.0</version>
</dependency>

dotnet add package Plivo

go get github.com/plivo/plivo-go/v7

Make an Outbound Call

Create a call from your Plivo number to any phone number. When the call is answered, Plivo fetches XML instructions from your answer_url.

import plivo

client = plivo.RestClient('<auth_id>', '<auth_token>')

response = client.calls.create(
    from_='+14151234567',  # Your Plivo number
    to_='+14157654321',    # Destination number
    answer_url='https://s3.amazonaws.com/static.plivo.com/answer.xml',
    answer_method='GET'
)

print(response)

const plivo = require('plivo');

const client = new plivo.Client('<auth_id>', '<auth_token>');

client.calls.create(
    '+14151234567',  // from
    '+14157654321',  // to
    'https://s3.amazonaws.com/static.plivo.com/answer.xml',  // answer_url
    { answerMethod: 'GET' }
).then(console.log);

require 'plivo'

api = Plivo::RestClient.new('<auth_id>', '<auth_token>')

response = api.calls.create(
  '+14151234567',  # from
  ['+14157654321'], # to
  'https://s3.amazonaws.com/static.plivo.com/answer.xml',  # answer_url
  'GET'  # answer_method
)

puts response

<?php
require 'vendor/autoload.php';
use Plivo\RestClient;

$client = new RestClient('<auth_id>', '<auth_token>');

$response = $client->calls->create(
    '+14151234567',  // from
    ['+14157654321'], // to
    'https://s3.amazonaws.com/static.plivo.com/answer.xml',  // answer_url
    ['answerMethod' => 'GET']
);

print_r($response);

import com.plivo.api.Plivo;
import com.plivo.api.models.call.Call;

public class MakeCall {
    public static void main(String[] args) {
        Plivo.init("<auth_id>", "<auth_token>");

        Call.creator("+14151234567", "+14157654321",
            "https://s3.amazonaws.com/static.plivo.com/answer.xml")
            .answerMethod("GET")
            .create();
    }
}

using Plivo;

var api = new PlivoApi("<auth_id>", "<auth_token>");

var response = api.Call.Create(
    from: "+14151234567",
    to: new[] { "+14157654321" },
    answerUrl: "https://s3.amazonaws.com/static.plivo.com/answer.xml",
    answerMethod: "GET"
);

Console.WriteLine(response);

package main

import "github.com/plivo/plivo-go/v7"

func main() {
    client, _ := plivo.NewClient("<auth_id>", "<auth_token>", &plivo.ClientOptions{})

    client.Calls.Create(plivo.CallCreateParams{
        From:         "+14151234567",
        To:           "+14157654321",
        AnswerURL:    "https://s3.amazonaws.com/static.plivo.com/answer.xml",
        AnswerMethod: "GET",
    })
}

curl -i --user AUTH_ID:AUTH_TOKEN \
    -H "Content-Type: application/json" \
    -d '{
        "from": "+14151234567",
        "to": "+14157654321",
        "answer_url": "https://s3.amazonaws.com/static.plivo.com/answer.xml",
        "answer_method": "GET"
    }' \
    https://api.plivo.com/v1/Account/{auth_id}/Call/

The sample answer.xml file plays a message:

<Response>
    <Speak>Congratulations! You've made your first outbound call!</Speak>
</Response>

Replace this URL with your own server endpoint to control call behavior dynamically.

Receive an Incoming Call

Set up a web server to handle incoming calls. When someone calls your Plivo number, Plivo sends a request to your Answer URL and executes the XML instructions you return.

from flask import Flask, Response
from plivo import plivoxml

app = Flask(__name__)

@app.route('/answer/', methods=['GET', 'POST'])
def answer_call():
    response = plivoxml.ResponseElement()
    response.add(plivoxml.SpeakElement('Hello! Thanks for calling.'))
    return Response(response.to_string(), mimetype='application/xml')

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)

Run: python app.py

const express = require('express');
const plivo = require('plivo');

const app = express();

app.all('/answer/', (req, res) => {
    const response = plivo.Response();
    response.addSpeak('Hello! Thanks for calling.');
    res.set('Content-Type', 'application/xml');
    res.send(response.toXML());
});

app.listen(5000, () => console.log('Server running on port 5000'));

Run: node app.js

require 'sinatra'
require 'plivo'

get '/answer/' do
    response = Plivo::XML::Response.new
    response.addSpeak('Hello! Thanks for calling.')
    content_type 'application/xml'
    response.to_xml
end

Run: ruby app.rb

<?php
require 'vendor/autoload.php';
use Plivo\XML\Response;

$response = new Response();
$response->addSpeak('Hello! Thanks for calling.');

header('Content-Type: application/xml');
echo $response->toXML();

import com.plivo.api.xml.Response;
import com.plivo.api.xml.Speak;
import static spark.Spark.*;

public class ReceiveCall {
    public static void main(String[] args) {
        get("/answer/", (req, res) -> {
            res.type("application/xml");
            return new Response()
                .children(new Speak("Hello! Thanks for calling."))
                .toXmlString();
        });
    }
}

using Microsoft.AspNetCore.Mvc;
using Plivo.XML;

[ApiController]
[Route("[controller]")]
public class AnswerController : ControllerBase
{
    [HttpGet]
    [HttpPost]
    public ContentResult Answer()
    {
        var response = new Response();
        response.AddSpeak("Hello! Thanks for calling.");
        return Content(response.ToString(), "application/xml");
    }
}

package main

import (
    "github.com/plivo/plivo-go/v7/xml"
    "net/http"
)

func main() {
    http.HandleFunc("/answer/", func(w http.ResponseWriter, r *http.Request) {
        response := xml.ResponseElement{
            Contents: []interface{}{
                new(xml.SpeakElement).SetContents("Hello! Thanks for calling."),
            },
        }
        w.Header().Set("Content-Type", "application/xml")
        w.Write([]byte(response.String()))
    })
    http.ListenAndServe(":5000", nil)
}

Run: go run main.go

Expose Your Server

Use ngrok to expose your local server to the internet:

ngrok http 5000

Copy the HTTPS forwarding URL (e.g., https://abc123.ngrok.io).

Configure Your Number

Go to Voice Applications in the Plivo console
Click Add New Application
Set the Answer URL to your ngrok URL + /answer/ (e.g., https://abc123.ngrok.io/answer/)
Save the application
Go to Active Numbers
Select your number and assign your application

Now call your Plivo number to hear the greeting!

Forward a Call

Dial another number when receiving an incoming call.

Python
Node.js
Ruby
PHP
cURL

from flask import Flask, Response
from plivo import plivoxml

app = Flask(__name__)

@app.route('/forward/', methods=['GET', 'POST'])
def forward_call():
    response = plivoxml.ResponseElement()
    dial = plivoxml.DialElement()
    dial.add(plivoxml.NumberElement('+14157654321'))
    response.add(dial)
    return Response(response.to_string(), mimetype='application/xml')

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)

const express = require('express');
const plivo = require('plivo');

const app = express();

app.all('/forward/', (req, res) => {
    const response = plivo.Response();
    const dial = response.addDial();
    dial.addNumber('+14157654321');
    res.set('Content-Type', 'application/xml');
    res.send(response.toXML());
});

app.listen(5000);

require 'sinatra'
require 'plivo'

get '/forward/' do
    response = Plivo::XML::Response.new
    dial = response.addDial()
    dial.addNumber('+14157654321')
    content_type 'application/xml'
    response.to_xml
end

<?php
require 'vendor/autoload.php';
use Plivo\XML\Response;

$response = new Response();
$dial = $response->addDial();
$dial->addNumber('+14157654321');

header('Content-Type: application/xml');
echo $response->toXML();

Example XML to return:

<Response>
    <Dial>
        <Number>+14157654321</Number>
    </Dial>
</Response>

Next Steps

Call API Reference

Complete API documentation for managing calls

XML Reference

All XML elements for call control

Use Cases

Common voice application patterns

Webhooks

Handle call events in real-time

Framework-Specific Guides

For detailed setup with specific frameworks:

Language	Frameworks
Python	Flask, Django, FastAPI
Node.js	Express, NestJS, Serverless
Ruby	Sinatra, Rails
PHP	PHP Server
Java	Spring, Spark
.NET	ASP.NET Core, .NET Framework
Go	Standard Library, Martini

Environment Variables

Store credentials securely using environment variables:

export PLIVO_AUTH_ID=your_auth_id
export PLIVO_AUTH_TOKEN=your_auth_token

All Plivo SDKs automatically read these variables when you initialize the client without arguments:

# Python
client = plivo.RestClient()  # Reads from environment

// Node.js
const client = new plivo.Client();  // Reads from environment

Getting Started

Concepts

API Reference

XML Reference

SDKs

Troubleshooting

Voice Tutorials

Migration Guides

Voice API Quickstart

Prerequisites

Install the SDK

Make an Outbound Call

Receive an Incoming Call

Expose Your Server

Configure Your Number

Forward a Call

Next Steps

Call API Reference

XML Reference

Use Cases

Webhooks

Framework-Specific Guides

Environment Variables

Getting Started

Concepts

API Reference

XML Reference

SDKs

Troubleshooting

Voice Tutorials

Migration Guides

Documentation Index

​Prerequisites

​Install the SDK

​Make an Outbound Call

​Receive an Incoming Call

​Expose Your Server

​Configure Your Number

​Forward a Call

​Next Steps

Call API Reference

XML Reference

Use Cases

Webhooks

​Framework-Specific Guides

​Environment Variables

Prerequisites

Install the SDK

Make an Outbound Call

Receive an Incoming Call

Expose Your Server

Configure Your Number

Forward a Call

Next Steps

Framework-Specific Guides

Environment Variables