Trigger personalized notifications

Use the most relevant channels to consistently deliver messages to your users and prospects: Outbound Voice, Text Messages, or Ringless Voicemail

Craft a notification for any event

Craft a notification for any event. Incident alerts. Delivery notifications. Appointment reminders. Transactional notifications. SMS and call notifications can help you quickly and consistently communicate important information in any context. Complement voice notifications with SMS to increase the chances your message gets read and heard by the most people. Use your data more intelligently with our API.

Three text messages to confirm a wire transfer, notify a rider a driver has arrived and confirm a doctor's appointment

Bring your customers one-to-one communication

Give your users the opportunity to engage in two-way, one-to-one conversation with your brand. Customers can respond directly to your calls or SMS via Interactive Voice Response (IVR), Dual-Tone Multi-Frequency (DTMF), or by simply replying to an SMS as they would with a friend. Give your clients a voice.

Example of a conversation by sms between a company and a user

Empower your tech and customer service teams

Automatically generated Call Detail Record (CDR) and Delivery Receipts (DLR) give technical and customer support teams the data they need to get their job done, without having to contact the client. Problems get solved faster, teams stay efficient.

An SMS with the detail of its delivery (DLR)

A medium for each message

CALLR supports all flavours of voice and text outreach to reliably deliver notifications. Text messages are great for simple information, yet voice is the most effective medium to deliver and confirm the reception of critical messages.
Finally, straight-to-voicemail campaigns enable a soft-touch approach to chase clients and prospects.

Relay critical info on your favorite users' channels

Telco Made Easy

Thanks to our API, we are democratizing telcos: you don't need to be a telco expert to thrive with it. We provide you with code samples, extensive documentation, and a reliable support team to help you achieve a faster go-to-market in your business comms projects.

Enterprise-Grade Service

Ensuring a reliable service is as critical for us as it for you; we take every step required to secure its continuity with exhaustive and automated monitoring processes. Should you need any help, you will promptly find a helpful, reactive and top-notch support team ready to jump in.

Shared Expertise

We have the resources and expertise to help you thrive with your any VoIP phone systems: SIP or IAX. As a carrier, we operate our infrastructure in Europe and an interconnection network with tier 1 carriers in the rest of the world: you don't have to worry about coverage or delivery.

Flexibility Through Ownership

CALLR operates its own platform, so you can to cut out unnecessary intermediaries: no more black boxes! Our infrastructure built using open source technologies lowers your cost of ownership and grants you full end-to-end control over your business communications.

All-in-one Telecom

Reach more than 220 countries with unparalleled call quality from a single service. Our API acts as your friendly and exhaustive helper to the world of telecoms: it facilitates your implementation of any service, including real-time call control, phone numbers, IAX, or call tracking.

End-to-end Business Comms

We have been involved as carriers for more than nine years. We're happy to leverage that experience for you, and it goes beyond the mere delivery of your messages: our mission is end-to-end communications.

Cost-efficient notifications

I want to text/call in:

Voice (Billing is per second)

Inbound

$ /min

Number

$ /num/month

Outbound (landline)

$ /min

Outbound (mobile)

$ /min

SMS

Inbound

$ /sms

Outbound

$ /sms

Need high volumes of calls or texts? Bulk prices apply

Contact us for more information

Smart notification system fitting any scenario

Add notifications to your service with our API

CALLR's API is language agnostic and built for scale

Notifications in just a few lines of code! Our flexible API integrates with any existing systems thanks to webhooks. Keep control of your data: pushes CDR of calls made on your platform to an endpoint on your domain. Easily mix voice and SMS in your workflow with a one-stop shop communication API.

  • Send SMS (PHP)
  • Make a call (JS)
  • MT SMS DLR (Python)

Copied!

// composer require 'callr/sdk-php:dev-master' require 'vendor/autoload.php'; $api = new \CALLR\API\Client; $api->setAuthCredentials('login', 'password'); $from = 'Your Brand'; $to = '+33123456789'; $text = 'Hello, SMS world!'; $options = new stdClass; $options->force_encoding = 'GSM'; // or 'UNICODE' $options->nature = 'ALERTING'; // or 'MARKETING' $result = $api->call('sms.send', [$from, $to, $text, $options]);
// composer require 'callr/sdk-php:dev-master'

require 'vendor/autoload.php';

$api = new \CALLR\API\Client;
$api->setAuthCredentials('login', 'password');

$from = 'Your Brand';
$to   = '+33123456789';
$text = 'Hello, SMS world!';

$options = new stdClass;
$options->force_encoding = 'GSM'; // or 'UNICODE'
$options->nature = 'ALERTING'; // or 'MARKETING'

$result = $api->call('sms.send', [$from, $to, $text, $options]);
// npm install callr var callr = require('callr'); var api = new callr.api('login', 'password'); var target = { number: '+16469820800', timeout: 30 }; var messages = ['TTS|TTS_EN-GB_SERENA|Hello world! how are you? I hope you enjoy this call! good bye.']; api.call('calls.broadcast_1', target, messages, null).success(function(result) { // });
// npm install callr

var callr = require('callr');
var api = new callr.api('login', 'password');

var target = {
    number: '+16469820800',
    timeout: 30
};

var messages = ['TTS|TTS_EN-GB_SERENA|Hello world! how are you? I hope you enjoy this call! good bye.'];

api.call('calls.broadcast_1', target, messages, null).success(function(result) {
    //
});
# pip install callr import callr api = callr.Api("login","password") options = {'webhook': {'endpoint': 'http://yourdomain.com/webhook_path'}} result = api.call('sms.send', 'SMS', '+16469820820', 'Hello SMS world! (with DLR pushed to an URL endpoint)', options)
# pip install callr

import callr
api = callr.Api("login","password")

options = {'webhook': {'endpoint': 'http://yourdomain.com/webhook_path'}}

result = api.call('sms.send', 'SMS', '+16469820820', 'Hello SMS world! (with DLR pushed to an URL endpoint)', options)

In our industry, notifications need to arrive in a matter of seconds, not minutes – especially since our clients are billed by the minute.

Blaise Rabaud

CTO of CityScoot

Leading brands are trusting CALLR for their notifications

Engage your customers with timely notifications

custom sender

Custom Sender ID

Use an alphanumeric sender ID and be better identified by your prospects or customers. (Local limitations may apply).

analytics

Analytics

Our API transforms your calls and SMS raw data into easy-to-digest analytics.

shortcode

Shortcode and Long Virtual Number

For your business, you can choose between a shortcode (4 or 5 digits) and long virtual number for 2-WAY messaging. Local limitations may apply.

tts

Multilingual Text-to-Speech (TTS)

We automatically transform a written script into an audio speech in multiple languages so you don't have to manage multiple audio recordings.

webhook

Webhooks

We provide webhooks in the form of HTTP POST (JSON payload) for all kinds of trigger events (SMS delivery reports, call statuses, billing) so that you can safely build a real-time experience for your users.

mt

SMS Termination (MT)

Send SMS in more than 200 countries with very low latency and high deliverability.

mo

SMS Origination (MO)

Receive SMS from 40+ countries with very low latency and high deliverability. Local limitations may apply.

direct voicemail

Direct to voicemail

Leave a message on your recipient's voicemail without ringing their phone.

compliancy

Alerting vs Marketing Compliancy

We are compliant with rules applied by most countries in terms of whether the SMS is sent for notification or marketing purposes.