Entreprise-class SIP Trunking provider

Lower the cost of ownership of your business comms infrastructure. Pay as you go. Global network. Direct routes. Volume and usage discounts.

SIP Trunking & IAX

Our SIP & IAX solutions are world-class. We offer features such as elastic trunking, instant provisioning, direct interconnections and secured connections. Whether you are a call center with 25 or 200 agents, we can meet all of your SIP enterprise needs for call termination and origination.
We use the following major Codecs G.729, G.711A – PCMA and G.711U – PCMU and are compatible with all major VoIP softwares: Asterisk, Freeswitch, Vicidial, FreePBX...

SIP trunk - A datacenter linked to four phones

Cost-efficient global coverage

As a registered carrier, we benefit from direct fiber interconnection with top tier 1 carriers to provide you reliable service in over 220 countries. And regardless where your business, call center, or BPO is located, we can provide you access with localized numbers and network access.
Be it for outbound or inbound, we address all your calling needs. Thanks to our smart routing system, we are able to offer competitive prices that decrease with your volume of calls.

a world map with CALLR's data centers

Reactive support and security

Our SIP & IAX network is global. We can provide you reliable service with local interconnection through data centers wherever your network is located. Reliability is essential and that is why we only use top tier network companies and provide round the clock customer service. You can easily reach our customer support team, they give you a personalized, acute and timely assistance.

a phone with a clock next to it

Go further with our API

For a more sophisticated call experience, connect to our API to go beyond call termination: create scenarios for incoming calls using Interactive Voice Response (IVR), acquire and attribute numbers automatically, and much more. Get deeper insights with data concerning hang-up sources, call duration, recordings and other key metrics... SIP Trunking, supercharged.

SIP trunk - A terminal window opened with example of code on the background. An illustration with a server in a dialog bow forefront

Why are leading brands using CALLR?

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.

High quality SIP Trunking provider with low prices

I want to call:

Voice (Billing is per second)

Inbound

$ /min

Number

$ /num/month

Outbound (landline)

$ /min

Outbound (mobile)

$ /min

SMS

Inbound

$ /sms

Outbound

$ /sms

Bulk prices apply for high volumes of texts/calls

Contact us for more information

We’re very happy with CALLR – in 3 years we’ve never had a major problem, and their support team is extremely reactive.

Vincent Kraus

Co-Founder of SeniorAdom

More than just SIP trunking thanks to our API

IVR, Call Tracking, Number Allocation... One-API-stop for all your needs

Our API handles all your needs: buy and allocate numbers, control calls in real-time, design custom IVR diagram to handle inbound calls, create SMS or voice notifications for your apps and fetch detailed analytics of all the actions you undertook with our API... Use webhooks for efficient, event-triggered implementations.

  • PHP
  • JavaScript
  • Python
  • Ruby

Copied!

$api = new \CALLR\API\Client; $api->setAuthCredentials('login', 'password'); $target = (object) [ 'number' => '+16469820800', 'timeout' => 30 ]; $messages = ['TTS|TTS_EN-GB_SERENA|Hello world! how are you? I hope you enjoy this call. good bye.']; $result = $api->call('calls.broadcast_1', [$target, $messages, null]);
$api = new \CALLR\API\Client;
$api->setAuthCredentials('login', 'password');

$target = (object) [
  'number' => '+16469820800',
  'timeout' => 30
];

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

$result = $api->call('calls.broadcast_1', [$target, $messages, null]);
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) { // });
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) {
    //
});
api = callr.Api("login", "password") target = { 'number': '+16469820800', 'timeout': 30 } messages = ['TTS|TTS_EN-GB_SERENA|Hello world! how are you? I hope you enjoy this call. good bye.'] result = api.call('calls.broadcast_1', target, messages, None)
api = callr.Api("login", "password")

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

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

result = api.call('calls.broadcast_1', target, messages, None)
api = CALLR::Api.new('login', 'password') target = { :number => '+33123456789', :timeout => 30 } messages = ['TTS|TTS_EN-GB_SERENA|Hello world! how are you? I hope you enjoy this call. good bye.'] result = api.call('calls.broadcast_1', target, messages, nil)
api = CALLR::Api.new('login', 'password')

target = {
    :number => '+33123456789',
    :timeout => 30
}

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

result = api.call('calls.broadcast_1', target, messages, nil)

Easily bring your ideas to life with CALLR

They trust us

All the features you need for a custom call experience 

realtime

Real-time Call Control

We allow you to build a fully customisable phone experience with real-time routing, recording, voicemail, audio play and more. Initiate, receive and control calls to enrich your business workflows.

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.

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.

record

Call Recording

All calls can be recorded so you can keep record of conversations and improve quality of service.

detect voicemail

Voicemail Detection

We detect voicemail so you can focus on calling people who are present and you can actually talk to.

cdr

Call Detailed Report (CDR)

We provide the calls' raw data: caller (CLI) and callee numbers, duration, who hung up, hangup cause code, cost of the call, etc.