Connect to a global voice service provider

Colt has a wide portfolio of voice services with a broad international coverage now extended to more than 40 countries in Europe, Asia, and North America. Colt serves the enterprise, reseller and wholesale segments with a tailored service wrap and is ideally positioned to meet the growing global challenges of our customers. We deliver a flexible – with on-demand automation through portal or API – and resilient all-catering capabilities for our Enterprise services and Wholesale & Resellers.


Your connectivity options explained

Colt voice services portfolio is fully cloud enabled and delivers managed Unified Communications and front office customer contact services from freephone numbers to omnichannel cloud contact centres.  High Availability SIP connectivity ensure always on service both with cloud service providers/OTT BYOC (Bring Your Own Carrier) solutions and to the customer premises.  Colt can provide communication solutions in Europe including :

  • Managed IVR (IN Services)
  • Microsoft Teams Unified Communications
  • Contact centre solutions to fit any size business



Cloud Voice Connections

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Colt offers a one stop shop for all your voice connection needs, globally with full regulatory compliance.

We can help you connect voice wherever you need, including:

Bring your voice to Microsoft Teams with Operator Connect or Direct Routing, or both!

Cloud SIP Trunking solutions to simplify all your telecommunications via Cloud SBC (Cloud SIP), SIP Trunking or ISDN SIP Trunk Voice line (v)

Inbound number solutions such as toll-free, geographic, premium-rate and shared cost numbers.

BYOC - Colt can connect to Microsoft, Google, Genesys, Zoom, Twillio, Cisco and in fact anywhere on our global footprint where you need to activate voice for your users

Cloud Voice Solutions

Intelligent Communications

Colt can offer you a full end to end cloud based solution for all your Unified Communications and Contact Centre needs.

Cloud Voice works when:

You want to empower your organisation with a cloud-based customer experience solution, connected on a single network, without intrastructure installation

You need to connect staff working remotely through a messaging app such as Microsoft Teams

You are looking to implement a Teams solution, but already have a carrier (BYOC)

Wholesale & Resellers

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Colt offer a portfolio of comprehensive Wholesale VoIP propositions addressing the needs of Carriers, Resellers and Service Providers.

Our Wholesale voice offerings include:

Colt Number Hosting is your one-stop shop to enter wholesale Voice markets: it’s quick, cost efficient, simple, consistent, regulatory compliant & fully automated thanks to our APIs.

Colt IN over SIP – wholesale IN services specifically addresses the needs of Service Providers looking for dial-in numbers for their call centres and conferencing services

Colt Intelligent Communications for resellers allows your organisation to quickly and easily offer your customers a Cloud platform to enable Voice on Microsoft Teams

Our global voice network

Colt Voice portfolio delivers reliable and affordable carrier and enterprise business grade services to enterprises.

Colt Voice Coverage Map 2024

Automate the everyday with Cloud Voice

What does your future workplace look like?

In your future workplace, people will expect instant connections, a choice of how to communicate, and they will expect to spend less time on the mundane.

It’s time to automate the boring tasks and time-consuming parts of your business, to free up your workforce to spend time where they can add value.

Download our latest guide to discover how cloud voice can create a more productive, unified, and profitable workplace to carry you through the next decade.

Join over 25k+ customers


Why choose Colt?

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Full regulatory compliance

We offer full regulatory compliance across all of our geographies - now extended to 40+ countries in Europe, Asia, Australia and North America.

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Always a quick time to market

React to changing demands in your business with ease, and add new telephone numbers to your existing service in just 3 days.

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Centralise your services to a single provider

It can be challenging to work with multiple providers across different countries - Colt can operate as your one-stop-shop for global voice services.

Still not sure?

We'll help you build a solution tailor-made for your specific voice environment and networking needs.

With more connected data centres across Europe, USA & Asia than any other provider backed up with the carrier-grade Colt IQ Network, whatever you choose, you're in safe hands.