Voice Services

HomeVoice Services

Colt has a wide portfolio of business phone lines & systems with a broad international coverage now extended to 29 countries in Europe, Asia, Australia, and North America.

We serve enterprise, reseller and wholesale businesses with a tailored service wrap and is ideally positioned to meet the growing global challenges of our customers. We deliver flexible - with on-demand services - and resilient all-catering capabilities for our enterprise services, while at the same time we offer completely automated solutions for our carriers and resellers.

Colt voice services portfolio includes outbound voice services to connect to enterprises’ PBXs – either traditional ISDN services or SIP Trunking – as well as inbound voice services (e.g. 0800 Freephone) that include value-added customer contact centre services. As enterprises are increasingly looking at moving their communication infrastructure to the cloud, we provide unified communications as a service solution as an alternative to customer-owned premise-based PBX.

Our global voice solutions:


SIP/ISDN Services

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


Unified Communications

Colt provides flexible and scalable unified communications solutions as a service, fully managed end-to-end.


IN Services

Colt Intelligent Network (IN) Services is a managed portfolio of inbound voice services that provide our customer’s callers with an improved user experience, whilst maximising the performance of the customer’s call centre.


Service Provider Solutions

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

How Colt solves the challenges of providing international voice services:

Your one-stop shop

It's difficult to work with multiple providers across your countries, so Colt is your one-stop-shop for your global voice needs

Full regulatory compliance

We offer full regulatory compliance across all our geographic regions, saving you time and complexity

Quick time to market

React to changing demands with ease - add new telephone numbers to your service in just 3 days

Extensive coverage

We can support your expansion with developed markets across 4 continents & 29 countries.